by damned truths

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In the Save As function the 0-12 quality scale is used, but in the Save For Web function a 0-100 scale is used. That 0-100 scale is probably close to the 1-99 scale specified in the standards. I compared the file sizes from the different settings, using a 21 MP image (so that the metadata is tiny compared to the image data), and came to this approximate ...


Just opening and closing a JPEG file should not trigger a save command (in any program that I know of) and therefore there is no re-compression taking place. For the times that you actually DO hit "save", what happens depends on what changes you've made and how smart the image program in question is. The user CutNGlass has already mentioned an example of ...

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