Hello Dtic
Thank You that You teke effort to help my in my problem.
I test everything including change name for L to R without effect.
Experimentally I find whot is the problem . When I draw rectangle on preview I was droping coursour outside crop area and the crop does't have effect .
Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ
BookCrop - batch crop right/left page images
Re: BookCrop - batch crop right/left page images
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Re: BookCrop - batch crop right/left page images
Ok, I see the error. I will fix it in the next version. Until then draw rectangles only very close to the edges. 

Re: BookCrop - batch crop right/left page images
BookCrop work great now 

Re: BookCrop - batch crop right/left page images
BookCrop version 2018-10-21 released
https://github.com/nod5/BookCrop
https://github.com/nod5/BookCrop