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for anyone experiencing dirty transparent backgrounds when you transform transparent PNG images with Craft like this:
Source Image:
Resized, dirty:
Craft Command: craft.assets.id(2).first().getUrl({width: 300})
If you don't see the dirt, watch screen from the side!
The reason is the GD image library. If you switch to imagick, the transparent background will be clean:
Resized, clean:
