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Improve WebP settings #21

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e9b90f9
Improve WebP settings
jonnyawsom3 Jul 28, 2025
6a89b5f
Better comments
jonnyawsom3 Oct 19, 2025
35b54dc
Merge branch 'Yellow-Dog-Man:main' into EncodingTweaks
jonnyawsom3 Oct 28, 2025
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19 changes: 12 additions & 7 deletions Source/FreeImage/PluginWebP.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -471,21 +471,27 @@ EncodeImage(FIMEMORY *hmem, FIBITMAP *dib, int flags) {
WebPConfigInit(&config);

config.thread_level = 1;
// quality/speed trade-off (0=fast, 6=slower-better)
config.method = 0;

config.exact = (flags & WEBP_EXACT) == WEBP_EXACT;

if((flags & WEBP_LOSSLESS) == WEBP_LOSSLESS) {
// lossless encoding
// Lossless encoding
config.lossless = 1;
config.quality = 100;
// Size/speed trade-off. Method 0 quality 0 = fastest but largest file-size. Method 6 quality 100 = slowest and smallest file-size.
// NOTE: "quality" in this context is NOT related to anything visual, it purely effects time spent encoding.
config.method = 0;
config.quality = 0;
picture.use_argb = 1;

} else if((flags & 0x7F) > 0) {
// lossy encoding
// Lossy encoding
config.lossless = 0;
// quality is between 1 (smallest file) and 100 (biggest) - default to 75
// Quality/size/speed trade-off (0=fast, 6=slower-better)
config.method = 5;
// Improves color accuracy for the forced 4:2:0 color subsampling in lossy WebP.
// NOTE: In rare cases SharpYUV can cause some colors to become more red.
config.use_sharp_yuv = 1;
// Quality is between 0 (smallest file) and 100 (biggest) - default to 75
config.quality = (float)(flags & 0x7F);
if(config.quality > 100) {
config.quality = 100;
Expand Down Expand Up @@ -701,4 +707,3 @@ InitWEBP(Plugin *plugin, int format_id) {
plugin->supports_icc_profiles_proc = SupportsICCProfiles;
plugin->supports_no_pixels_proc = SupportsNoPixels;
}