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gronostaj203831dDifferent compression vs. quality tradeoff setting.
deadlyRants474731dJpeg has a quality setting. Higher quality means more iterations when it approximates the original image, and that means more data.
Most image editors will let you change the quality seeing before saving.
coffeeholic100331dbecause you need space for rootkits too
> you can't make more quality from a compressed image can you !
That's correct. But once you decompress the image to display or edit it, programs are completely unaware that it was compressed before, it's just a bunch of uncompressed pixels again. Saving it as JPEG will degrade quality due to compression again - you can't "reuse" old compression.
Every now and then you can see terribly compressed memes on various social media sites. It's not because the quality setting is low. It's because every time someone saves the image and uploads to another site, it gets compressed again and again and again, each time adding new quality losses.