>using one pixel Unforunately it is much more complex. You need to read the book on algorythms I recommended earlier to understand some of the problems. For a start just think about what rasterization does to straight lines that are shot at an oblique angle. You will tell me that the fix is simple, just average by a certain edge filter. Yes, but there is shading in the picture, and blemishes, and ... read the book ;-) Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body