New answers tagged facebook
If you need to upload an image absolutely losslessly to Facebook, you should upscale your image 800% in nearest-neighbor mode (GIMP can do this with the 'none' scaling filter, I'd be suprised if Photoshop can't). This works because JPEG compresses 8x8 blocks of pixels. I've done this with pixel art before. If you have a high resolution photo, you might find ...
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