>>8025171>leaving it uncompressedYour image has been cropped, resized and recompressed.
It has worse banding than the original:
https://windowswallpaper.miraheze.org/wiki/BloomResaving an image with 100% JPEG quality doesn't magically restore any lost quality.
Here, I upscaled the original from 4k to 5k, blurred the background in 16bpc, and applied dithering when going back down to 8bpc, to get rid of the banding.
The bands in the original image are ~1 RGB value away from another, so the banding is a limitation of 8bpc color.
The only way to solve the problem is with dithering.
Full 5120x2880 (too big to post here):
https://files.catbox.moe/f7jfo5.pngDo not resize or recompress it to JPEG as it will destroy the dithering, and banding will reappear.
