Previews looked more saturated than the exported files on Mac screens. The
pixels are the same: preview and export match to within one level on the CPU
and GPU paths, and exports embed a correct sRGB profile. But wgpu leaves the
window's Metal layer without a colour space for sRGB surfaces, and Core
Animation shows such a layer without colour matching ("If nil, no
colormatching occurs", CAMetalLayer.h). On a P3 screen the sRGB previews
were therefore shown too saturated, while Preview and Photos convert the
exports properly.
While no monitor profile is chosen in Settings > Display, the desktop app now
shows previews through the profile of the screen the window is on
(NSWindow.screen.colorSpace.ICCProfileData, safe objc2 calls), through the
existing display-profile path. It is read again about once a second, so
moving the window to another screen is followed. A chosen profile still wins;
"Use Screen Profile" goes back to it. app.displayProfile reports it as
path: null, screen: true. Other platforms and headless sessions are
unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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