The GraphicsMagick homepage has a list of differences. But it might be a bit biased. In general, GraphicsMagick seems to be faster (see e.g. this article), with a more stable API and less bugs. Many big websites uses it instead of ImageMagick.
The GraphicsMagick homepage has a list of differences. But it might be a bit biased. In general, GraphicsMagick seems to be faster (see e.g. this article), with a more stable API and less bugs. Many big websites uses it instead of ImageMagick.