Re: Converting colored areas to b/w hatchings with outline

On Mon, 18 Apr 2011 14:15:45 +0200
[email protected] wrote:
| 
| I have a set of images using up to four different colors
| contrastively in addition to a white/transparent background
| and some black areas/text, and need to convert these to b/w
| versions with each color replaced by a hatch/dot pattern,
| and preferably with each hatched area outlined with a thin
| black border. I know how to replace a color by another color
| from the command line but not how to replace a color with a
| pattern. However I'm totally at a loss on how to achieve a
| black outline around a colored area.  Additionally I'd like
| to do this in a perl script.
| 
Sorry for a black outline, run the image thru edge.


  convert areas.gif -edge 1 -threshold 20%  -negate cracks.gif


  Anthony Thyssen ( System Programmer )    <[email protected]>
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