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Switch the Color struct back to storing unassociated alpha (#4518)

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* Switch Color struct back to storing unassociated alpha

* Address review feedback

* Update the Invert node and legacy image migration for straight alpha and add round-trip tests

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>
This commit is contained in:
Dennis Kobert
2026-09-12 08:22:54 +00:00
committed by GitHub
parent e725f55043
commit 944d00cac5
13 changed files with 103 additions and 139 deletions
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4
node-graph/libraries/wgpu-executor/src/texture_conversion.rs
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@@ -115,9 +115,7 @@ impl RasterGpuToRasterCpuConverter {
let start = row * row_stride;
let row_slice = &view[start..start + row_bytes];
for px in row_slice.chunks_exact(4) {
// `Image<Color>` pixels are stored linear-light with associated (premultiplied) alpha
let srgba = SRGBA8::new(px[0], px[1], px[2], px[3]);
cpu_data.push(Color::from(srgba).apply_opacity(px[3] as f32 / 255.));
cpu_data.push(SRGBA8::new(px[0], px[1], px[2], px[3]).into());
}
}