Interestingly, the PE gurus say that to make big reductions it's best to do it in increments of no more than 10% at a time.
I don't know for sure why they would recommend that. You certainly
don't want to repeatedly
save a JPEG image because of the repeated information loss during compression. If you're not saving, or at least, not saving to JPEG, at each increment, you may not be losing anything. If PE is using a poor image scaling algorithm, the 10% steps may indeed (at least, in some cases), give better results than one big jump. Maybe if you
see the intermediate results, you won't realize how bad the final result is (a little bit of psychology there: compare images
n-1 and
n, not
1 and
n)!
Long ago, when the world was young and JPEG was a new format, I helped a co-worker with an image viewer problem. He complained that his JPEG images were "deteriorating" over time, with repeated viewings. The problem is that he thought he was simply
exiting the viewer, but he was actually
saving and then
exiting. Each time, information (image quality) was being lost.
Phil
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