Having dealt with and printed a lot of <i>very</i> large images, e.g., 60k x 60k pixels, I have been on the lookout for image processing software that never decompresses the entire image into ram, but instead works on blocks or scan lines or blocks of scan lines, but stays in constant memory and streams to and from disk. For example, the ImageMagick fork GraphicsMagick does a much better job of this than ImageMagick. What other software is out there that can handle these kinds of images?