I use Numeric to transfer images between various image processing systems. Numarray includes most of the image data memory layouts that I have seen except for: Some C types need to be added (as several people have already commented). Some systems define an array as a "pointer to an array of pointers to ...". "Numerical Recipes in C" explains this approach clearly. Could this perhaps be implemented in Numarray as a buffer interface with multiple data segments? Thanks, Ed Jones