A somewhat updated fork from GraphicsMagick for node
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var assert = require('assert')
module.exports = function (gm, dir, finish, GM) {
if (gm._options.imageMagick)
return finish();
var g = gm.monochrome().dither();
var args = g.args();
assert.equal('convert', args[0]);
assert.equal('-monochrome', args[2]);
assert.equal('-dither', args[3]);
if (!GM.integration)
return finish();
g.write(dir + '/dither.png', function dither (err) {
finish(err);
});
}