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Android 15 has tools to fix washed-out SDR content on HDR displays. What does that even mean?
A fix for content mismatch.
Viewing the same content on an SDR display means those colors are going to mix — grey looks like black, ivory looks like white, you see fewer shades of yellow, etc. Sure, we want everything to look great, but if a photo or two on a page of thumbnails looks goofy, it's not a big deal, especially if once you open one, the image is displayed correctly. By default, your phone knows the right amount of brightness and contrast increase that should happen when showing HDR content but developers can have some control inside their apps.
Or read this on Android Central