: Gimp Non-square resize I've been tearing my hair out trying to figure out how to get gimp to do a scale in the way I want. I think what I'm after is either a non-linear scale, or a trapezoid

@Dunderdale640

Possible solution with a displace map:


Create a group, with two layers:


At the bottom a layer that expresses the max displacement wanted: a black to white gradient (gray 50% is "no change", white and black will move things in opposite directions)
Above, an "attenuator" layer that will slowly grade the black-to-white gradient to a plain 50% gray (we don't want any changes on the right)
This layer has a layer mask with a black-to-white gradient (so, on the left, the displacement mask is seen in full, while, on the right, it fades into a play gray 50%). In practice this isn't strictly linear, but this can be compensated by using Curves to change the layer mask gradient.





Then call Filters>Map>Displace map, and give the group as a displace map for the Y coordinate.

The result:

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@BetL875

Although it does not fit your needs for this case, the "Perspective Transform tool" is what is used to achieve results like this - in order to simuate a 3d-space tilt of a 2D drawing.

As you had noted this far, there is no simple transform that can acheive what you want - I hope the displace hack provided in the other answer can it you, but otherwise, you'd rather try scripting the transform you want.

I yu want just a grid, a script to draw the ines directly. Otherwise, a script to perform a 1 pixel wide scale transform for each column in your image is the thing you should do.

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