Post #1700444
2026-04-16 08:53 UTC
Interesting. Clearly (https://github.com/Shpigford/clearly, https://clearly.md) uses XDR (Extreme Dynamic Range) white (and super bright blue) headroom colors in its application icon. You can see this effect – where bright white areas can appear even brighter than standard white – in the Dock and in Quick Look on the .app bundle, but not when viewing AppIcon.icns directly. I’ll explain why below. 🧵… (1/6)
/cc @marcedwards @stroughtonsmith
Replies (2)
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@vancura@mastodon.design 2026-04-16 08:53
The AppIcon.icns file only has flat 8-bit sRGB PNGs, so it doesn’t include any HDR data. The XDR effect actually comes from Assets.car, which contains an AppIcon.iconstack, a new layered icon format since macOS 14 (Sequoia). The Dock, Finder, and Quick Look in the app bundle all use .iconstack, while Quick Look uses the AppIcon.icns with the flat sRGB image. (2/6)
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@marcedwards@mastodon.social 2026-04-16 09:59
@vancura That’s for the @! That’s really interesting. I didn’t realise that was possible. +@stroughtonsmith