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Originally Posted by Tannin
An interesting discussion, Stephen.
Ahhh ... but that's the thing: a JPEG doesn't throw away 75% of the pixels. JPEG compression, at least as as I understand it, retains every pixel. What it does is throw away some of the colour information (on the theory that the human eye is quite good at telling the difference between different brightness levels, but not very good at detecting fine graduations in colour).
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Ah you are right, wrong use of techical terms on my part
What I should have referred to is the loss of data as in bytes. It is this of course that allows the file to be reduced in size. The fact is as well that this loss will lead to jpeg artefacts etc over time. I did read however that someone had opened and resaved a jpeg file many many times at max quality 12 in PS and had not found any dicernable loss in quality.