In article <1990Aug14.203212.16248 at motcad.portal.com> jtc at motcad.portal.com (J.T. Conklin) writes: >Another useful table is one that flips the bits 1-for-0,0-for-1. This >is useful for inverting an image. How about: (assuming 8 bit char c) c=255-c; or c^=255; - John_Lauro at ub.cc.umich.edu