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1

Maybe try filling a square with a linear gradient that goes from white to black to white, then do a perspective transform on it.


0

You can do this very in a easy way using adobe photoshop 2020. Here is a script for this and how to use it video. https://youtu.be/6ICVsi2pWyk


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You can use this script to do this in few clicks https://youtu.be/6ICVsi2pWyk


1

The best way is to use Gimp's Perspective tool in Corrective mode. You put the 4 corner handles of the tool on the 4 corners of what should be a rectangle, and let it work its magic. Caution: none of this really restores the actual aspect ratio, your result will be rectangular but stretched in one dimension, you often have to resort to other clues (easy if ...


2

What you seem to be describing is not called cropping. What you are trying to do is a type of perspective distortion. In Photoshop you can use Edit > Transform > Distort, to straighten up a photo of a document so it looks perpendicular. There is also a similar Unified Transform tool (Shift+T) in GIMP (which is free). Example in Photoshop (before and after) ...


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There's already in a comment a proper receipe. You fill a layer with overlapping stamps which have transparent backgrounds. Insert a layer mask, fill it with black at first. Then paint white to the mask. That's effectively the same as you painted with stamps. If you want to build your own fake stamps the job will be gigantic. You can buy a collection from ...


1

I guess the problem is common for people who try to utilize easy (see NOTE1) to get popular images for example by making prints on textiles. Your image example has low contrast, the apparent geometry is in many areas based on gradients and color differences. There are only a few strong contrast borders, for ex. the eyes. For that reason essential parts are ...


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