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i hate to reply nearly 9 months later but I discovered that on PocketBook Color, saturation boost happens inside adjustAreaDefault(), which only runs on dithered refreshes. Folder covers don’t set that flag, but EPUB covers do so the same page looks vivid or washed out depending on what’s in it.
Two possible fixes:
1. Make the folder-cover patch set the same dithered flag as normal cover images.
2. Call adjustAreaDefault() unconditionally for color PocketBooks instead of tying it to the dither flag... simpler, but it costs extra CPU and may increase ghosting on non-image pages.
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