> I took KSnapshot out of the picture, and took the screenshot with Gimp,
> saved it as a png. The file size was 35k. I scaled the image by 50%
> and saved it as a new png. The file size was 44k.
> I reduced the file by 50% using imageMagick and the file size was 71k.
> convert file1.png -resize 50% file3.png
> I did an imagemagick identify on file2 (44k) and file3 (71k), and they
> both display the dimensions as 340x272.
> The image is a snapshot of the body of the KDE Kate editor, which is
> mostly text.

Oh, then the answer is simple. The scaled-down version compresses not as
good as the original size. PNG uses run-length compression, which works
very nicely on graphics that have areas of solid colors. By scaling down
the image, you make the image less suitable for this kind of


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