Actually, I may be wrong about why the cropping stops. Using customwidth and customheight, I set the dimensions to being much bigger than the image and also much smaller than the source image. In both conditions, the same pages show the same cropping results, so I have no idea why the cropping stops sometimes.
See attached images (resized to fit forum limits):
1,4: Some margin left from the top of the page
2: Part of the page number is left on the botton
3: The whole page number is still on the bottom
I'll investigate to find a lossless jpeg cropper and just uniformly crop out the bottom x number of pixels from all pages to remove the page numbers. This way, KCC just has to worry about finding the margins.
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