Monday 1 October 2018

software rec - Transform a trapezium into a rectangle


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.



Answer



In GIMP, it is called the perspective tool. I think it is the same in Photoshop.


There is an icon for it in the menu on the left. It looks like a trapezoid with two arrows at the bottom corners.


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