CODEWITHSUNDEEP
image-processingimagemagickimagemagick-convertgraphicsmagick
user636044
user636044

Reputation:

Applying custom ImageMagick (GraphicsMagick) envelope distortion to text

I want to generate text like this using ImageMagick:

Warped text

I have the font as a TTF file and know how to generate an image with just the undistorted text. What I'm having trouble with is applying the distortion.

The "envelope" I want to use looks like this:

Envelope

I've been reading over ImageMagick's examples on distortions but can't seem to figure out the right command.

Please note, this is not an arc.

Upvotes: 4

Views: 778

Answers (1)

Andrea
Andrea

Reputation: 12375

This is a quite complex task: ImageMagick has some built-in distortion effects, but no one resembles the one you need.

To achieve your goal you can try to define a custom distortion: for example using image maps (in particular absolute distortion lookup maps, more info here).

Basically you create a black/white gradient image (the map) that define how a particular effect should be applied to every single pixel of the image.

The tricky part is correctly generating image map: you can do it manually or using ImageMagick.

For example this command taken from ImageMagick docs creates a spherical distortion map:

  convert -size 100x100 xc:  -channel R \
          -fx 'yy=(j+.5)/h-.5; (i/w-.5)/(sqrt(1-4*yy^2))+.5' \
          -separate  +channel     sphere_lut.png

this is the resulting image:

spherical distortion map

once you've created your distortion map you can apply it to your image for example with:

convert input.png lut_mask.png -fx 'p{ v*w, j }' output.png

Upvotes: 2

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