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I have a specific perspective transformation that I want to apply to an image. How can I enter the matrix values manually in GIMP instead of playing around with stretching the image until the numbers come out right (which is virtually impossible)?

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I'm afraid currently there's no way to specify transformation matrix in Gimp other than writing a plugin/script yourself or using one of the MathMap operations. MathMap is actually standalone app, but it can be used as a plugin for Gimp.

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MathMap is currently not available on Linux, but you can achieve the same thing in imagemagick using the -affine -transform options. –  sebastian_k Jul 25 at 14:34
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Oh, but it is available :). The project page misses only “official” binaries, but the source is there. Besides, most distros build their binaries from sources anyway, so… –  thebodzio 2 days ago

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