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Is there a way to use custom imagemagick commands on a image style action. I'm trying to create a dither effect like the ones shown on the examples on the imagemagik site: http://www.imagemagick.org/Usage/quantize/#dither.

Here's another example: http://caca.zoy.org/study/out/lena5-2-1.png.

The command on the imagemagick website looks like this:

  convert colorwheel.png -dither Riemersma      -colors 16 dither_riemersma.gif

plus

  convert  logo.png  -remap pattern:gray50  mono_remap.gif
  convert -size 15x640 gradient: -rotate 90 \
                   -remap pattern:gray50     mono_remap_gradient.gif

but I don't know how or if it is possible to add this to an action.

Can someone shed some light on this? Is there an alternative method to accomplish this?

2 Answers 2

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Imagecache actions has a 'custom' action which allows you to run your own actions. It may help you, though I used it years ago on a drupal 6 site with GD so can not say for certain if it will work for you.

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Solved it by using the Raw ImageMagick Effect module and adding a custom action with the following option:

-remap pattern:gray50

Final action should look like this after saving it:

Raw ImageMagick options -remap pattern:gray50

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