Hi, As discussed in todays TCON, PNGImageIO does not produce a valid output when given an image whose start index is not 0,0. Insight/Examples/ImageRegionIterator illustrates this problem. Josh. ______________________________ Josh Cates School of Computer Science University of Utah Email: cates@sci.utah.edu Phone: (801) 587-7697 URL: http://www.sci.utah.edu/~cates