CompuServe Thread

There are basically two ways to reduce the jagged edges on lines which result from all raster displays: 1) Increase the resolution so they aren't as noticable, or 2) use Anti-Aliasing to reduce the perception of the edges. The first method is the only one useable without grayscale or color shading, and is basically why laser printers seem to have smooth lines. On a grayscale or color display, you can use the second method. This consists of filling in the gaps, so to speak, with a halfway color. For example, given the following line: ######## ######## ######## Pretty jagged, huh? But change it to: ########++– –++########++– –++######## And the jagged edges aren't quite as obvious. (It works a lot better with smaller pixels… <grin>) The line appears a bit thicker but is much cleaner looking. A quick and easy aliasing solution would be to scan each line, and where a color change occurs, set one pixel halfway between the first color and the second. That should give you a good first approximation of what you want. –>Steve Bennett

Bill, The best way that I have found to get rid of the jaggies is to import a bitmapped image of the logo (a 300 DPI scanned image is what I use) into a program like ProDraw (Gold Disk) and then trace the image by hand using the structured drawing tools provided. I personally do not have the time/patience or skills required to use these drawing tools very well… so instead of tracing the image by hand, I use a utility that comes with ProDraw called TRACE which will automatically convert trace the image and output it to a structured clip that can then be loaded in to ProDraw. Programs like Prof Page (Gold Disk) and PageStream (SoftLogic) will allow you to import the clip and you can then resize it with no loss in resolution and use it in the dtp layout program. The clip may also be output directly from ProDraw to a postscript or non-postscript printer, or saved as an EPSF. – Whapp!ng from the North Coast Michael

Bill, in addition, you can download a picture of mine called FLICKER.PIC (I can't remember the exact 6-character name I uploaded it under) It shows how some color combinations flicker more than others, and has a half-circle drawn both normally and with anti-aliasing. If you don't find another example of anti-aliasing somwehere else, FLICKER may be worth the (short) download. Blaq! – via Whap!