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And if I compress my JPG more drastically, say 80 or 90%, will the ratio JPEG vs TIFF quality drop by a great deal, or is it negligible?
Anyway, I can’t remember, but I don’t think that compressing a lot a JPG makes a huge difference in file size…
I can’t really tell you that; my idea of “quality” may be different from yours. 🙂 All you have to do is save a few JPGs at different compression ratios, and compare to a TIFF! FastStone Image Viewer has a compare feature that makes it very easy.
Depending on the software you use, compressing even a little bit can have a huge impact on file-size! Here’s an example from Lightroom. (Taken from this thread: https://www.lenspiration.com/forums/topic/resize-and-compression-tools-for-photographers/) As you can see, when you go from 100% quality to 90% quality, you lose 1/3 of your “weight”; from 92KB to only 33KB!
I don’t know what Adobe did, but their JPG engine for Lightroom is very good, if I remember correctly, there wasn’t any visible difference between 100% and 75-80%! And the file-size difference is at least 1/2, if not less!
I never save JPG files at 100% any more, unless for special purposes. The whole point in JPG is to save on file-size, so if you’re going to use it, make it save! If you need lossless, use TIFF or PNG.