diff --git a/CHANGELOG.md b/CHANGELOG.md
index c27cd77f..0f96a378 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+**Version 0.15.0 (unreleased)**
+ - [SEMVER_MINOR] Check images for correctness before writing result ([#60](https://github.com/shssoichiro/oxipng/issues/60))
+ - Fix invalid output when reducing image to a different color type but file size does not improve ([#60](https://github.com/shssoichiro/oxipng/issues/60))
+
 **Version 0.14.4**
  - Fix bug when reducing RGBA to Indexed if image has 256 colors plus a background color
 
diff --git a/Cargo.lock b/Cargo.lock
index 0f7f4682..e9e05b6d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5,13 +5,13 @@ dependencies = [
  "bit-vec 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.20.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy 0.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "image 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "zopfli 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -24,7 +24,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "adler32"
-version = "0.3.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -65,8 +65,8 @@ name = "cargo_metadata"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.9.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -77,7 +77,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "term_size 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-segmentation 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -87,22 +87,22 @@ dependencies = [
 
 [[package]]
 name = "clippy"
-version = "0.0.114"
+version = "0.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cargo_metadata 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy_lints 0.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy_lints 0.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "clippy_lints"
-version = "0.0.114"
+version = "0.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "matches 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "quine-mc_cluskey 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-normalization 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -112,15 +112,15 @@ name = "crc"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "deflate"
-version = "0.7.4"
+version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "adler32 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "adler32 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -203,12 +203,12 @@ dependencies = [
 
 [[package]]
 name = "lazy_static"
-version = "0.2.2"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.20"
+version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -221,7 +221,7 @@ name = "memchr"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -230,14 +230,9 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "nom"
-version = "1.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "num-integer"
 version = "0.1.33"
@@ -271,10 +266,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "num_cpus"
-version = "1.2.1"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -283,7 +278,7 @@ version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "deflate 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "deflate 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "inflate 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-iter 0.1.33 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -295,7 +290,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "quote"
-version = "0.3.13"
+version = "0.3.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -303,7 +298,7 @@ name = "rand"
 version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -312,8 +307,8 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -342,33 +337,38 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "semver"
-version = "0.2.3"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nom 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "serde"
-version = "0.9.9"
+version = "0.9.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_codegen_internals"
-version = "0.14.0"
+version = "0.14.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "syn 0.11.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "0.9.9"
+version = "0.9.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quote 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_codegen_internals 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.11.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_codegen_internals 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -379,7 +379,7 @@ dependencies = [
  "dtoa 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -394,17 +394,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "0.11.6"
+version = "0.11.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quote 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "synom 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "synom"
-version = "0.11.0"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -416,7 +416,7 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -426,7 +426,7 @@ version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -511,7 +511,7 @@ dependencies = [
 
 [metadata]
 "checksum adler32 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e928aa58f6dbd754bda26eca562a242549cb606e27a2240fc305fc75a7f12af9"
-"checksum adler32 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "57be033eb4100070a93a9400a725839cda9c415244f808b0357e72b9e003d5ba"
+"checksum adler32 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3ff33fe13a08dbce05bcefa2c68eea4844941437e33d6f808240b54d7157b9cd"
 "checksum aho-corasick 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0638fd549427caa90c499814196d1b9e3725eb4d15d7339d6de073a680ed0ca2"
 "checksum ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "23ac7c30002a5accbf7e8987d0632fa6de155b7c3d39d0067317a391e00a2ef6"
 "checksum bit-vec 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "5b97c2c8e8bbb4251754f559df8af22fb264853c7d009084a576cdf12565089d"
@@ -520,10 +520,10 @@ dependencies = [
 "checksum byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c40977b0ee6b9885c9013cd41d9feffdd22deb3bb4dc3a71d901cc7a77de18c8"
 "checksum cargo_metadata 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "34fdab49a2904acb112c83b62f0118de3de3ce28e52a9188dec2858e43878f25"
 "checksum clap 2.20.5 (registry+https://github.com/rust-lang/crates.io-index)" = "7db281b0520e97fbd15cd615dcd8f8bcad0c26f5f7d5effe705f090f39e9a758"
-"checksum clippy 0.0.114 (registry+https://github.com/rust-lang/crates.io-index)" = "808f9027f62dda9f764f26542a10465a6db221a5bd57981a63a2f84a6518b098"
-"checksum clippy_lints 0.0.114 (registry+https://github.com/rust-lang/crates.io-index)" = "e5d58f7fdb30f25e6c4dac79d0156bec6fb69834ba270dc2dc2e12754cebef75"
+"checksum clippy 0.0.118 (registry+https://github.com/rust-lang/crates.io-index)" = "6cb0894ce1af2464033706bf9b33e28c4a8fc72df8449fcd60f7a5162a7a9630"
+"checksum clippy_lints 0.0.118 (registry+https://github.com/rust-lang/crates.io-index)" = "67d4bf7c7bb21b11b4d62146bcc8abaaf4e230a6346a21c9e88fa0c3540c71a4"
 "checksum crc 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc1914fae6f18ae347320f0ba5e4fc270e17c037ea621fe41ec7e8adf67d11b0"
-"checksum deflate 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "24c5f3de3a8e183ab9a169654b652407e5e80bed40986bcca92c2b088b9bfa80"
+"checksum deflate 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ebb02aaf4b775afc96684b8402510a338086974e38570a1f65bea8c202eb77a7"
 "checksum deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1614659040e711785ed8ea24219140654da1729f3ec8a47a9719d041112fe7bf"
 "checksum dtoa 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "80c8b71fd71146990a9742fc06dcbbde19161a267e0ad4e572c35162f4578c90"
 "checksum either 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "63f94a35a9ca0d4178e85f0250373f2cea55c5d603e6993778d68a99b3d8071c"
@@ -535,34 +535,34 @@ dependencies = [
 "checksum itertools 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)" = "d95557e7ba6b71377b0f2c3b3ae96c53f1b75a926a6901a500f557a370af730a"
 "checksum itoa 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "eb2f404fbc66fd9aac13e998248505e7ecb2ad8e44ab6388684c5fb11c6c251c"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-"checksum lazy_static 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6abe0ee2e758cd6bc8a2cd56726359007748fbf4128da998b65d0b70f881e19b"
-"checksum libc 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)" = "684f330624d8c3784fb9558ca46c4ce488073a8d22450415c5eb4f4cfb0d11b5"
+"checksum lazy_static 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7291b1dd97d331f752620b02dfdbc231df7fc01bf282a00769e1cdb963c460dc"
+"checksum libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)" = "88ee81885f9f04bff991e306fea7c1c60a5f0f9e409e99f6b40e3311a3363135"
 "checksum matches 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "efd7622e3022e1a6eaa602c4cea8912254e5582c9c692e9167714182244801b1"
 "checksum memchr 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1dbccc0e46f1ea47b9f17e6d67c5a96bd27030519c519c9c91327e31275a47b4"
 "checksum miniz-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "28eaee17666671fa872e567547e8428e83308ebe5808cdf6a0e28397dbe2c726"
-"checksum nom 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a5b8c256fd9471521bcb84c3cdba98921497f1a331cbc15b8030fc63b82050ce"
 "checksum num-integer 0.1.33 (registry+https://github.com/rust-lang/crates.io-index)" = "21e4df1098d1d797d27ef0c69c178c3fab64941559b290fcae198e0825c9c8b5"
 "checksum num-iter 0.1.33 (registry+https://github.com/rust-lang/crates.io-index)" = "f7d1891bd7b936f12349b7d1403761c8a0b85a18b148e9da4429d5d102c1a41e"
 "checksum num-rational 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "c2dc5ea04020a8f18318ae485c751f8cfa1c0e69dcf465c29ddaaa64a313cc44"
 "checksum num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "e1cbfa3781f3fe73dc05321bed52a06d2d491eaa764c52335cf4399f046ece99"
-"checksum num_cpus 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a225d1e2717567599c24f88e49f00856c6e825a12125181ee42c4257e3688d39"
+"checksum num_cpus 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a18c392466409c50b87369414a2680c93e739aedeb498eb2bff7d7eb569744e2"
 "checksum png 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3cb773e9a557edb568ce9935cf783e3cdcabe06a9449d41b3e5506d88e582c82"
 "checksum quine-mc_cluskey 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "07589615d719a60c8dd8a4622e7946465dfef20d1a428f969e3443e7386d5f45"
-"checksum quote 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)" = "08de3f12e670f83f61e450443cbae34496a35b665691fd8e99b24ec662f75865"
+"checksum quote 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "7375cf7ad34a92e8fd18dd9c42f58b9a11def59ab48bec955bf359a788335592"
 "checksum rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "022e0636ec2519ddae48154b028864bdce4eaf7d35226ab8e65c611be97b189d"
 "checksum rayon 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "50c575b58c2b109e2fbc181820cbe177474f35610ff9e357dc75f6bac854ffbf"
 "checksum regex 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4278c17d0f6d62dfef0ab00028feb45bd7d2102843f80763474eeb1be8a10c01"
 "checksum regex-syntax 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2f9191b1f57603095f105d317e375d19b1c9c5c3185ea9633a99a6dcbed04457"
 "checksum rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "237546c689f20bb44980270c73c3b9edd0891c1be49cc1274406134a66d3957b"
-"checksum semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2d5b7638a1f03815d94e88cb3b3c08e87f0db4d683ef499d1836aaf70a45623f"
-"checksum serde 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)" = "05a67b8a53f885f4b6e3ed183806035819f9862474e747fe4488a6d63bcbfcb7"
-"checksum serde_codegen_internals 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a5113d5bd16471b183803b374f0fe4877ad9658b95e33b11f4a004d73aacc74a"
-"checksum serde_derive 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)" = "a85017d774504173e5f908f69790ad7616f535f4ea91d0cdc65676ea3c933709"
+"checksum semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3186ec9e65071a2095434b1f5bb24838d4e8e130f584c790f6033c79943537"
+"checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+"checksum serde 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)" = "a702319c807c016e51f672e5c77d6f0b46afddd744b5e437d6b8436b888b458f"
+"checksum serde_codegen_internals 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4d52006899f910528a10631e5b727973fe668f3228109d1707ccf5bad5490b6e"
+"checksum serde_derive 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)" = "f15ea24bd037b2d64646b4d934fa99c649be66e3f7b29fb595a5543b212b1452"
 "checksum serde_json 0.9.8 (registry+https://github.com/rust-lang/crates.io-index)" = "6501ac6f8b74f9b1033f7ddf79a08edfa0f58d6f8e3190cb8dc97736afa257a8"
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-"checksum synom 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8fece1853fb872b0acdc3ff88f37c474018e125ef81cd4cb8c0ca515746b62ed"
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diff --git a/Cargo.toml b/Cargo.toml
index d6e79dbd..24d48eaa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,15 +38,15 @@ version = "^2.10.0"
 optional = true
 version = ">=0.0.85"
 
-[dependencies.regex]
-optional = true
-version = "^0.2.0"
-
-[dev-dependencies.image]
+[dependencies.image]
 default-features = false
 features = ["png_codec"]
 version = "^0.12.0"
 
+[dependencies.regex]
+optional = true
+version = "^0.2.0"
+
 [features]
 default = ["binary"]
 binary = ["clap", "regex"]
diff --git a/src/error.rs b/src/error.rs
index c10aa40f..41f5fa28 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -7,12 +7,14 @@ pub struct PngError {
 }
 
 impl Error for PngError {
+    #[inline]
     fn description(&self) -> &str {
         &self.description
     }
 }
 
 impl fmt::Display for PngError {
+    #[inline]
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{}", self.description)
     }
diff --git a/src/lib.rs b/src/lib.rs
index 322883ca..6f242f4a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,7 @@
 extern crate bit_vec;
 extern crate byteorder;
 extern crate crc;
+extern crate image;
 extern crate itertools;
 extern crate libc;
 extern crate miniz_sys;
@@ -13,7 +14,9 @@ extern crate zopfli;
 
 use deflate::Deflaters;
 use error::PngError;
+use image::{GenericImage, Pixel, ImageFormat};
 use headers::Headers;
+use png::PngData;
 use rayon::prelude::*;
 use std::collections::{HashMap, HashSet};
 use std::fs::{File, copy};
@@ -286,16 +289,13 @@ pub fn optimize(filepath: &Path, opts: &Options) -> Result<(), PngError> {
     }
 
     let in_file = Path::new(filepath);
-    let original_size = in_file.metadata().unwrap().len() as usize;
-    let mut png = match png::PngData::new(in_file, opts.fix_errors) {
-        Ok(x) => x,
-        Err(x) => return Err(x),
-    };
+    let in_data = PngData::read_file(in_file)?;
+    let mut png = PngData::from_slice(&in_data, opts.fix_errors)?;
 
     // Run the optimizer on the decoded PNG.
-    let optimized_output = optimize_png(&mut png, original_size, opts);
+    let optimized_output = optimize_png(&mut png, &in_data, opts)?;
 
-    if is_fully_optimized(original_size, optimized_output.len(), opts) {
+    if is_fully_optimized(in_data.len(), optimized_output.len(), opts) {
         writeln!(&mut stderr(), "File already optimized").ok();
         return Ok(());
     }
@@ -408,13 +408,10 @@ pub fn optimize_from_memory(data: &[u8], opts: &Options) -> Result<Vec<u8>, PngE
         writeln!(&mut stderr(), "Processing from memory").ok();
     }
     let original_size = data.len() as usize;
-    let mut png = match png::PngData::from_slice(data, opts.fix_errors) {
-        Ok(x) => x,
-        Err(x) => return Err(x),
-    };
+    let mut png = PngData::from_slice(data, opts.fix_errors)?;
 
     // Run the optimizer on the decoded PNG.
-    let optimized_output = optimize_png(&mut png, original_size, opts);
+    let optimized_output = optimize_png(&mut png, data, opts)?;
 
     if is_fully_optimized(original_size, optimized_output.len(), opts) {
         writeln!(&mut stderr(), "Image already optimized").ok();
@@ -425,10 +422,16 @@ pub fn optimize_from_memory(data: &[u8], opts: &Options) -> Result<Vec<u8>, PngE
 }
 
 /// Perform optimization on the input PNG object using the options provided
-fn optimize_png(mut png: &mut png::PngData, file_original_size: usize, opts: &Options) -> Vec<u8> {
+fn optimize_png(png: &mut PngData,
+                original_data: &[u8],
+                opts: &Options)
+                -> Result<Vec<u8>, PngError> {
     type TrialWithData = (u8, u8, u8, u8, Vec<u8>);
 
+    let original_png = png.clone();
+
     // Print png info
+    let file_original_size = original_data.len();
     let idat_original_size = png.idat_data.len();
     if opts.verbosity.is_some() {
         writeln!(&mut stderr(),
@@ -485,9 +488,9 @@ fn optimize_png(mut png: &mut png::PngData, file_original_size: usize, opts: &Op
         }
     }
 
-    let something_changed = perform_reductions(&mut png, opts);
+    let reduction_occurred = perform_reductions(png, opts);
 
-    if opts.idat_recoding || something_changed {
+    if opts.idat_recoding || reduction_occurred {
         // Go through selected permutations and determine the best
         let combinations = if opts.deflate == Deflaters::Zlib {
             filter.len() * compression.len() * memory.len() * strategies.len()
@@ -569,10 +572,12 @@ fn optimize_png(mut png: &mut png::PngData, file_original_size: usize, opts: &Op
                          png.idat_data.len())
                     .ok();
             }
+        } else if reduction_occurred {
+            png.reset_from_original(original_png);
         }
     }
 
-    perform_strip(&mut png, opts);
+    perform_strip(png, opts);
 
     let output = png.output();
 
@@ -609,47 +614,65 @@ fn optimize_png(mut png: &mut png::PngData, file_original_size: usize, opts: &Op
         }
     }
 
-    output
+    let old_png = image::load_from_memory_with_format(original_data, ImageFormat::PNG);
+    let new_png = image::load_from_memory_with_format(&output, ImageFormat::PNG);
+
+    if let Ok(new_png) = new_png {
+        if let Ok(old_png) = old_png {
+            if old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
+               new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() {
+                return Ok(output);
+            }
+        } else {
+            // The original image might be invalid if, for example, there is a CRC error,
+            // and we set fix_errors to true. In that case, all we can do is check that the
+            // new image is decodable.
+            return Ok(output);
+        }
+    }
+
+    writeln!(&mut stderr(), "The resulting image is corrupted and will not be outputted.\nThis is a bug! Please report it at https://github.com/shssoichiro/oxipng/issues").ok();
+    Err(PngError::new("The resulting image is corrupted"))
 }
 
 /// Attempt all reduction operations requested by the given `Options` struct
 /// and apply them directly to the `PngData` passed in
 fn perform_reductions(png: &mut png::PngData, opts: &Options) -> bool {
-    let mut something_changed = false;
+    let mut reduction_occurred = false;
 
     if opts.palette_reduction && png.reduce_palette() {
-        something_changed = true;
+        reduction_occurred = true;
         if opts.verbosity == Some(1) {
             report_reduction(png);
         }
     }
 
     if opts.bit_depth_reduction && png.reduce_bit_depth() {
-        something_changed = true;
+        reduction_occurred = true;
         if opts.verbosity == Some(1) {
             report_reduction(png);
         }
     }
 
     if opts.color_type_reduction && png.reduce_color_type() {
-        something_changed = true;
+        reduction_occurred = true;
         if opts.verbosity == Some(1) {
             report_reduction(png);
         }
     }
 
-    if something_changed && opts.verbosity.is_some() {
+    if reduction_occurred && opts.verbosity.is_some() {
         report_reduction(png);
     }
 
     if let Some(interlacing) = opts.interlace {
         if png.change_interlacing(interlacing) {
             png.ihdr_data.interlaced = interlacing;
-            something_changed = true;
+            reduction_occurred = true;
         }
     }
 
-    something_changed
+    reduction_occurred
 }
 
 /// Display the status of the image data after a reduction has taken place
diff --git a/src/main.rs b/src/main.rs
index 82729573..b15be14f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -231,16 +231,16 @@ fn main() {
                             .unwrap()
                             .map(PathBuf::from)
                             .collect(),
-                        opts);
+                        &opts);
 }
 
-fn handle_optimization(inputs: Vec<PathBuf>, opts: Options) {
+fn handle_optimization(inputs: Vec<PathBuf>, opts: &Options) {
     for input in inputs {
         let mut current_opts = opts.clone();
         if input.is_dir() {
             if current_opts.recursive {
                 handle_optimization(input.read_dir().unwrap().map(|x| x.unwrap().path()).collect(),
-                                    current_opts)
+                                    &current_opts)
             } else {
                 writeln!(&mut stderr(),
                          "{} is a directory, skipping",
diff --git a/src/png.rs b/src/png.rs
index 3692ac88..9ff1aa86 100644
--- a/src/png.rs
+++ b/src/png.rs
@@ -183,7 +183,14 @@ pub struct PngData {
 
 impl PngData {
     /// Create a new `PngData` struct by opening a file
+    #[inline]
     pub fn new(filepath: &Path, fix_errors: bool) -> Result<PngData, PngError> {
+        let byte_data = PngData::read_file(filepath)?;
+
+        PngData::from_slice(&byte_data, fix_errors)
+    }
+
+    pub fn read_file(filepath: &Path) -> Result<Vec<u8>, PngError> {
         let mut file = match File::open(filepath) {
             Ok(f) => f,
             Err(_) => return Err(PngError::new("Failed to open file for reading")),
@@ -194,8 +201,7 @@ impl PngData {
             Ok(_) => (),
             Err(_) => return Err(PngError::new("Failed to read from file")),
         }
-
-        PngData::from_slice(&byte_data, fix_errors)
+        Ok(byte_data)
     }
 
     /// Create a new `PngData` struct by reading a slice
@@ -273,6 +279,17 @@ impl PngData {
         Ok(png_data)
     }
 
+    #[doc(hidden)]
+    pub fn reset_from_original(&mut self, original: PngData) {
+        self.idat_data = original.idat_data;
+        self.ihdr_data = original.ihdr_data;
+        self.raw_data = original.raw_data;
+        self.palette = original.palette;
+        self.transparency_pixel = original.transparency_pixel;
+        self.transparency_palette = original.transparency_palette;
+        self.aux_headers = original.aux_headers;
+    }
+
     /// Return the number of channels in the image, based on color type
     #[inline]
     pub fn channels_per_pixel(&self) -> u8 {
@@ -330,6 +347,7 @@ impl PngData {
     }
 
     /// Return an iterator over the scanlines of the image
+    #[inline]
     pub fn scan_lines(&self) -> ScanLines {
         ScanLines {
             png: self,
diff --git a/tests/files/issue-60.png b/tests/files/issue-60.png
new file mode 100644
index 00000000..7fd3731a
Binary files /dev/null and b/tests/files/issue-60.png differ
diff --git a/tests/filters.rs b/tests/filters.rs
index df0980f6..dba811d0 100644
--- a/tests/filters.rs
+++ b/tests/filters.rs
@@ -1,8 +1,5 @@
-extern crate image;
 extern crate oxipng;
 
-use image::GenericImage;
-use image::Pixel;
 use oxipng::colors::{BitDepth, ColorType};
 use oxipng::png;
 use std::collections::HashSet;
@@ -52,13 +49,6 @@ fn test_it_converts(input: &Path,
     assert_eq!(png.ihdr_data.color_type, color_type_out);
     assert_eq!(png.ihdr_data.bit_depth, bit_depth_out);
 
-    let old_png = image::open(input).unwrap();
-    let new_png = image::open(output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
diff --git a/tests/flags.rs b/tests/flags.rs
index 1ce3ad3f..61a82299 100644
--- a/tests/flags.rs
+++ b/tests/flags.rs
@@ -1,8 +1,5 @@
-extern crate image;
 extern crate oxipng;
 
-use image::GenericImage;
-use image::Pixel;
 use oxipng::colors::{BitDepth, ColorType};
 use oxipng::deflate::Deflaters;
 use oxipng::headers::Headers;
@@ -54,13 +51,6 @@ fn test_it_converts(input: &Path,
     assert_eq!(png.ihdr_data.color_type, color_type_out);
     assert_eq!(png.ihdr_data.bit_depth, bit_depth_out);
 
-    let old_png = image::open(input).unwrap();
-    let new_png = image::open(output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -111,13 +101,6 @@ fn strip_headers_list() {
     assert!(png.aux_headers.contains_key("iTXt"));
     assert!(!png.aux_headers.contains_key("iCCP"));
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -152,13 +135,6 @@ fn strip_headers_safe() {
     assert!(!png.aux_headers.contains_key("iTXt"));
     assert!(png.aux_headers.contains_key("iCCP"));
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -193,13 +169,6 @@ fn strip_headers_all() {
     assert!(!png.aux_headers.contains_key("iTXt"));
     assert!(!png.aux_headers.contains_key("iCCP"));
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -234,13 +203,6 @@ fn strip_headers_none() {
     assert!(png.aux_headers.contains_key("iTXt"));
     assert!(png.aux_headers.contains_key("iCCP"));
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -271,13 +233,6 @@ fn interlacing_0_to_1() {
 
     assert_eq!(png.ihdr_data.interlaced, 1);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -308,13 +263,6 @@ fn interlacing_1_to_0() {
 
     assert_eq!(png.ihdr_data.interlaced, 0);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -349,13 +297,6 @@ fn interlacing_0_to_1_small_files() {
     assert_eq!(png.ihdr_data.color_type, ColorType::Indexed);
     assert_eq!(png.ihdr_data.bit_depth, BitDepth::One);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -390,13 +331,6 @@ fn interlacing_1_to_0_small_files() {
     assert_eq!(png.ihdr_data.color_type, ColorType::Indexed);
     assert_eq!(png.ihdr_data.bit_depth, BitDepth::One);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -430,13 +364,6 @@ fn interlaced_0_to_1_other_filter_mode() {
 
     assert_eq!(png.ihdr_data.interlaced, 1);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
diff --git a/tests/interlaced.rs b/tests/interlaced.rs
index bd3b8d0d..4c57cf8e 100644
--- a/tests/interlaced.rs
+++ b/tests/interlaced.rs
@@ -1,8 +1,5 @@
-extern crate image;
 extern crate oxipng;
 
-use image::GenericImage;
-use image::Pixel;
 use oxipng::colors::{BitDepth, ColorType};
 use oxipng::png;
 use std::collections::HashSet;
@@ -53,13 +50,6 @@ fn test_it_converts(input: &Path,
     assert_eq!(png.ihdr_data.color_type, color_type_out);
     assert_eq!(png.ihdr_data.bit_depth, bit_depth_out);
 
-    let old_png = image::open(input).unwrap();
-    let new_png = image::open(output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
diff --git a/tests/lib.rs b/tests/lib.rs
index 65d2d592..681e5723 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -1,4 +1,3 @@
-extern crate image;
 extern crate oxipng;
 
 use std::default::Default;
diff --git a/tests/reduction.rs b/tests/reduction.rs
index 079a61c4..2852decf 100644
--- a/tests/reduction.rs
+++ b/tests/reduction.rs
@@ -1,8 +1,5 @@
-extern crate image;
 extern crate oxipng;
 
-use image::GenericImage;
-use image::Pixel;
 use oxipng::colors::{BitDepth, ColorType};
 use oxipng::png;
 use std::collections::HashSet;
@@ -53,13 +50,6 @@ fn test_it_converts(input: &Path,
     assert_eq!(png.ihdr_data.color_type, color_type_out);
     assert_eq!(png.ihdr_data.bit_depth, bit_depth_out);
 
-    let old_png = image::open(input).unwrap();
-    let new_png = image::open(output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -1264,13 +1254,6 @@ fn palette_should_be_reduced_with_dupes() {
     assert_eq!(png.ihdr_data.bit_depth, BitDepth::Eight);
     assert_eq!(png.palette.unwrap().len(), 35 * 3);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -1304,13 +1287,6 @@ fn palette_should_be_reduced_with_unused() {
     assert_eq!(png.ihdr_data.bit_depth, BitDepth::Eight);
     assert_eq!(png.palette.unwrap().len(), 33 * 3);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -1344,12 +1320,5 @@ fn palette_should_be_reduced_with_both() {
     assert_eq!(png.ihdr_data.bit_depth, BitDepth::Eight);
     assert_eq!(png.palette.unwrap().len(), 33 * 3);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
diff --git a/tests/regression.rs b/tests/regression.rs
index 3a248cec..626bf7a1 100644
--- a/tests/regression.rs
+++ b/tests/regression.rs
@@ -1,8 +1,5 @@
-extern crate image;
 extern crate oxipng;
 
-use image::GenericImage;
-use image::Pixel;
 use oxipng::colors::{BitDepth, ColorType};
 use oxipng::png;
 use std::collections::HashSet;
@@ -52,13 +49,6 @@ fn test_it_converts(input: &Path,
     assert_eq!(png.ihdr_data.color_type, color_type_out);
     assert_eq!(png.ihdr_data.bit_depth, bit_depth_out);
 
-    let old_png = image::open(input).unwrap();
-    let new_png = image::open(output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -108,13 +98,6 @@ fn issue_42() {
     assert_eq!(png.ihdr_data.color_type, ColorType::GrayscaleAlpha);
     assert_eq!(png.ihdr_data.bit_depth, BitDepth::Eight);
 
-    let old_png = image::open(&input).unwrap();
-    let new_png = image::open(&output).unwrap();
-
-    // Conversion should be lossless
-    assert!(old_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>() ==
-            new_png.pixels().map(|x| x.2.channels().to_owned()).collect::<Vec<Vec<u8>>>());
-
     remove_file(output).ok();
 }
 
@@ -252,3 +235,18 @@ fn issue_59() {
                      ColorType::RGBA,
                      BitDepth::Eight);
 }
+
+#[test]
+fn issue_60() {
+    let input = PathBuf::from("tests/files/issue-60.png");
+    let opts = get_opts(&input);
+    let output = opts.out_file.clone();
+
+    test_it_converts(&input,
+                     &output,
+                     &opts,
+                     ColorType::RGBA,
+                     BitDepth::Eight,
+                     ColorType::GrayscaleAlpha,
+                     BitDepth::Eight);
+}