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Hello Willus, first I'd like to thank you for making this software, it's simply amazing, pretty much all material are in pdf format and k2pdfopt has made some unreadable think on kindle amazing to read.
But I am having problems with photo-copied/scanned material, the kind where there are two pages side by side, I tried using the 2 column feature to split the pages, but I guess that because the scans are low quality the detection isn't working well, some pages get split in the wrong areas and others just don't get split at all.
What I've been doing is, using the crop areas feature and selecting each page, and it works well, the output is in the correct sequence and it treats each crop as it's page, instead of processing the entire image, the problem here is simply that, I can't set a crop for each file, so because of their lack of centering and different sizes, the crop never lines up properly, so I have to do them one by one.
I've also been running into the issue of text getting split in badly centered pdfs, I've been putting -f2p -1 into the additional options like you recommend in the FAQ, but I couldn't the "bp" options in the gui.
And another less common problem is that, there are some high quality color scans, that have the beige color of the page, and the output ends up being grayscale with a gray background which is annoying to read, and I wanted to know if there's a way to make the output monochrome, -bpc 1 sometimes works but the text quality is really, and sometimes the output just comes out completely mangled, I've tried -wt[+] <threshold>, but I think I don't understand how to use that command, because even -wt[+] 0 doesn't output pure white, I was hoping to do something something like -wt[+] 60 since it's a rather dark grey.
I wanted to ask if you have some advice to get better results there, I'm using the GUI version provided on the website.
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