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I used my iPhone to capture a painting. However, the angle was not perfect, so instead of getting a straight rectangle, I get a trapezium. I want to transform this trapezium back into a rectangle (using some affine transformation). However, I cannot find a good way to do it. Please advise.
My guest would be I can select four points in the captured photo and define the other 4 points of the rectangle and have the software transform it for me based on the coordinates of these points. However, I cannot figure out how to do that with GIMP – Phuong Nguyen – 2010-03-09T03:00:59.617
As in the dupe - have a look at Imagemagick http://www.imagemagick.org/script/index.php
– Linker3000 – 2011-08-17T09:43:27.990