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Basically, each time I save, if I save as 100% quality, is there any more loss in image quality, and can I mitigate that by using a different format?
Thanks in advance!
In most cases it will get worse. If you convert them to a format that uses compression algo - you loose quality. Even if you open JPG and then save it as JPG - you loose quality.
Better leave them as they are, and don't convert to anything.
So, if I take the original JPG, edit it, then save it as XCF, if I go back and make further changes, I'm not going to lose any more image quality no matter how many changes I make.
Once it is saved in XCF format, the quality stays the same. Am I right or wrong in this assumption?
only ever convert back to a jpeg (if required for the web for instance) as the very last stage of your work
IMO you should convert them to psd (or whatever)
Good advice, but rather than convert them, use 'save as' (batch for multiple) - leaving the originals in tact. If your camera has the option for raw file output, I would keep them this way. JPEG naturally compresses the image.
Store your raw files and then use a lossless format for editing them. I prefer tiff [google.com] and then you compress them into JPEG for the web.
My old digital camera shot JPGs. If I was going to do much editing to one of them I'd work with a TIFF copy. Every time you open and save a JPG, the image degrades a little more.