Questions and postings pertaining to the development of ImageMagick, feature enhancements, and ImageMagick internals. ImageMagick source code and algorithms are discussed here. Usage questions which are too arcane for the normal user list should also be posted here.
Recent versions of ImageMagick permit you to specify the crop dimension as part of the image filename, e.g. 'image.dpx[320x260+300+200]' which might be less resource constrained. Otherwise, you may need to use the stream program which was designed to extract a region of an image efficiently.