Quote:
Originally Posted by HarryT
If you reduce the size of a JPEG file you are discarding information. The result may look very similar, but it's incorrect to say that you're not "changing the quality of the graphics at all".
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Some changes can be lossless, if done correctly with the correct tool: Discarding metadata, optimizing compression, removing color information in greyscale images (not exactly lossless, but lossless in practice), cropping extra margins...