GraphicsMagick is the swiss army knife of image processing. Comprised of 259K physical lines (according to David A. Wheeler´s SLOCCount) of source code in the base package (or 900K including 3rd party libraries) it provides a robust and efficient collection of tools and libraries which support reading, writing, and manipulating an image in over 88 major formats including important formats like DPX, GIF, JPEG, JPEG-2000, PNG, PDF, PNM, and TIFF.

GraphicsMagick