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@GMcG
Thanks for the additional testing. I will experiment with a larger test-base to see if my percentages come down---I only checked with 5 images.
I do usually use png, because jpeg seems to spit and spray a lot of pixels around, so there is often a faint halo of "outliers" around the edges and lines of line drawings. In this case though, I went with jpeg with a compression rate of 30%, and because the dimensions of the images are so small, the halos are not noticeable.
Thanks for the recommendation for IrfanView. I have it on my drive, but have mostly only used it for viewing -- the thumbnail view is useful. I am chicken about batch-processing. I will get brave when I get ready to finalize my current batch of 330 images!
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