Thank you Michael for your reply. around the same time I posted my email, someone informed me about the trim feature of ImageMagick. and it seems to do the job based on my brief testing. but, I would rather not have to do such an operation.
in Windows, I can put in variously sized papers into the scanner feed tray, and it'll automatically output matching page sizes. I do not have to do anything else. I wish Linux would be as simple as my windows experience in this particular case.
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