Ask A Cartographer

Web-safe ramp?

December 08 2008 | 0 comments
Categories: Publishing, Symbology

Where would one find a web-safe color ramp—preferably graduated rather than random? Or at least, how would you make one? One of our ArcIMS applications requires GIFs, and short of painstakingly assigning individual web-safe colors, I can't figure out how to avoid the very distracting dithering.

Thank you.

Mapping Center Answer:

You would have to do as you suspect - create a color ramp with the web safe colors.  I tried this out and it didn't take me all that long to create a web safe color ramp because we already have a set of web safe colors in the Web216 style.  I used the preset color ramp option - this allowed me to simply click the down arrows next to the colors and select from the color picker.  To show ONLY web safe colros in the color picker, I referenced only the Web216 style. Of course, your personal style is also referenced so any colors you have in there will also be shown.  This means that the order that the web safe colors are shown in will shift if you add or delete colors from your personal style.

One thing that speeds things up is that when the web safe colors are displayed in the color picker, they are arranged in such a way that you could make many of your desired ramps from the orders in which the colors are shown.

Note, too, that if you create your map with non-web safe colors in ArcMap and then export the map and open it in either Adobe Illustrator or Photoshop, you can display only web?safe colors using special functions in these softwre programs.

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