I have written a series of antialiasing routines that are substitutes for PLOT, CONTOUR, SURFACE, XYOUTS, etc., which were posted to the 'user contributions' section. (Unfortunately I haven't written one for PLOTS). I recently updated the whole set, and only one, CONTOURSMOOTH has been reposted by the sysadmin for download. Anyway, if you download CONTOURSMOOTH and look at what I did (which is pretty simple), you should be able to make an antialiased PLOTS line on your image. Cheers, Tobin

I am not sure that I understand your question. However, I DO know that there is a pitfall in plotting lines over an image in that it is easy to make the plot call in a way that the coordinate arguments to the plot do not match the pixel-location-based coordinates of the image. Thus, below is an example of the proper way to call PLOTS, if you want it to use the pixel-location-based coordinate system of the image: window, XSIZE=128, YSIZE=128 data = 255.0 - dist(128) ; Makes a light-colored 128 x 128 example image tv, data ; Make a diagonal line through the center of the image plots, [10,117], [10,117], COLOR=0, /DEVICE It is the "/DEVICE" setting that insures that PLOTS will use the pixel-location based coordinate system. James Jones