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How to flatten a curved paper photo?
#1
Hi,
I have a photo of test paper.When taking this picture, the paper was not laid flat. Now I'd like to flatten the curved part. How to do it? thank a lot.
[Image: 2019-10-28-16-40-31-20191028164135.png]
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#2
Some explanation about the item you are looking for is find in this forum : 

https://www.gimp-forum.net/Thread-correc...f-all-kind
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#3
It is going to depend on how many of these you have to process. No real automatic way that I know of, maybe someone will come up with something.

This using (1) Adjust the whole page with a trapezium deform then (2) the table with the gmic plugin - http://www.gmic.eu - interactive warp filter.  Never going to be wonderful and very user intensive.

   

and a 5 minute video how I got there: https://youtu.be/xRR0RbizQJA
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