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Black alpha before color type reductions

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Andrew 2022-12-04 18:25:59 +13:00 committed by Josh Holmer
parent 43d0ee8807
commit 716b5bf135
2 changed files with 8 additions and 1 deletions
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7
src/lib.rs
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@ -726,6 +726,13 @@ fn perform_reductions(
} }
if opts.color_type_reduction { if opts.color_type_reduction {
// Perform a black alpha reduction before color type reductions
// This can allow reductions from alpha to indexed which may not have been possible otherwise
if !opts.alphas.is_empty() {
if let Some(reduced) = filtered_alpha_channel(&png, AlphaOptim::Black) {
png = Arc::new(reduced);
}
}
if let Some(reduced) = reduce_color_type(&png, opts.grayscale_reduction) { if let Some(reduced) = reduce_color_type(&png, opts.grayscale_reduction) {
png = Arc::new(reduced); png = Arc::new(reduced);
eval.try_image(png.clone()); eval.try_image(png.clone());

2
src/reduction/mod.rs
View file

@ -12,7 +12,7 @@ use crate::bit_depth::reduce_bit_depth_8_or_less;
pub mod color; pub mod color;
use crate::color::*; use crate::color::*;
pub(crate) use crate::alpha::try_alpha_reductions; pub(crate) use crate::alpha::{filtered_alpha_channel, try_alpha_reductions};
pub(crate) use crate::bit_depth::reduce_bit_depth; pub(crate) use crate::bit_depth::reduce_bit_depth;
/// Attempt to reduce the number of colors in the palette /// Attempt to reduce the number of colors in the palette