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The bug was in `Color32::from_rgba_unmultiplied` and by extension affects: * `Color32::from_rgba_unmultiplied` * `hex_color!` * `HexColor` * `ColorImage::from_rgba_unmultiplied` * All images with transparency (png, webp, …) * `Color32::from_white_alpha` The bug caused translucent colors to appear too bright. ## More Color is hard. When I started out egui I thought "linear space is objectively better, for everything!" and then I've been slowly walking that back for various reasons: * sRGB textures not available everywhere * gamma-space is more _perceptually_ even, so it makes sense to use for anti-aliasing * other applications do everything in gamma space, so that's what people expect (this PR) Similarly, pre-multiplied alpha _makes sense_ for blending colors. It also enables additive colors, which is nice. But it does complicate things. Especially when mixed with sRGB/gamma (As @karhu [points out](https://github.com/emilk/egui/pull/5824#issuecomment-2738099254)). ## Related * Closes https://github.com/emilk/egui/issues/5751 * Closes https://github.com/emilk/egui/issues/5771 ? (probably; hard to tell without a repro) * But not https://github.com/emilk/egui/issues/5810 ## TODO * [x] I broke the RGBA u8 color picker. Fix it --------- Co-authored-by: Andreas Reich <andreas@rerun.io> |
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