[magick-users] Newbie PerlMagick floodfill question

[Anthony Thyssen]

rhubarbpie at poetworld.net on  wrote...
| 
| Greetings:
| 
| I'm generating this gif using PerlMagick.  Although the floodfill 
| command mostly works, why do I have the white outlines of the form and 
| circles?  I want a red for with black center dot and a 9:00 black dot 
| with white center.
| 
Flood fill, fills and replaces an exact color with the given color.

You can increase the color that is replaced to 'close colors' by using a
Fuzz Factor
  http://imagemagick.org/Usage/colors/#fuzz

However the preplacement color is left AS IS, so you loose any shading
effects that was used for anti-aliasing.

In fact it is the anti-aliased pixels around your circle that would
generate that white outline.

For more information on the problems of color replacement, and
specifically background replacement see
   http://imagemagick.org/Usage/channels/#mask_creation
This area of IM examples has never been completed, basically because
there is no current ideal solution. :-(

I have an idea for a 'shaded' flood fill type solution, but have had no
time to try to implement it.

If you (or someone else) come up with anything interesting, please let
us know.

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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            An expert practices until he doesn't get it wrong.
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