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Prevent conversion to indexed when palette reduction is off

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This commit is contained in:
Andrew 2026-03-28 10:57:37 +13:00
parent e4a7d0fd99
commit 6a1aa71691
2 changed files with 3 additions and 1 deletions
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2
src/cli.rs
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@ -298,6 +298,8 @@ The default value depends on the optimization level preset.")
.arg( .arg(
Arg::new("no-palette-reduction") Arg::new("no-palette-reduction")
.help("Do not change color palette") .help("Do not change color palette")
.long_help("\
Do not convert to indexed and do not modify an existing color palette.")
.long("np") .long("np")
.action(ArgAction::SetTrue), .action(ArgAction::SetTrue),
) )

2
src/reduction/mod.rs
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@ -118,7 +118,7 @@ pub(crate) fn perform_reductions(
// Attempt to reduce to indexed // Attempt to reduce to indexed
// Keep the existing `png` var in case it is grayscale - we can test both for depth reduction later // Keep the existing `png` var in case it is grayscale - we can test both for depth reduction later
let mut indexed = None; let mut indexed = None;
if opts.color_type_reduction && !deadline.passed() { if opts.color_type_reduction && opts.palette_reduction && !deadline.passed() {
if let Some(reduced) = reduced_to_indexed(&png, opts.grayscale_reduction) { if let Some(reduced) = reduced_to_indexed(&png, opts.grayscale_reduction) {
// Make sure the palette gets sorted (but don't bother evaluating both results) // Make sure the palette gets sorted (but don't bother evaluating both results)
let new = Arc::new(sorted_palette(&reduced).unwrap_or(reduced)); let new = Arc::new(sorted_palette(&reduced).unwrap_or(reduced));