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The visual quality of photorealistic images generated in the Gemini app seems terrible.

Like really ugly. The 1K output resolution isn't great, but on top of that it looks like a heavily compressed JPEG even at 100% viewing size.

Does AI Studio have the same issue? There at least I can see 2K and 4K output options.

I have a couple of 25MB PNG 4K images from AI Studio here:

At close-up inspection – 8x8 JPEG compression blocks are not going anywhere even with those "4k PNG images"

Seems like a fundamental flaw with image-models is that they will always output something resembling a JPEG