On 8/29/06, Henning Makholm
My concrete need is that I edit bitmaps with a specific color
convention - they can be seen e.g. at <http://dk.trackmap.net/a>.  I
use a system of ad-hoc software to convert the bitmap source to the
vector versions linked to below the image; this software depends on
the exact colormap in the picture, because different colors should be
vectorized in different ways.


This need could be solved using layer-masks and threshold. Or to
attack the problem with an unstable dialect of xml:

<image width='751' height='650'>
<layers>

<layer name='brown'>
 <layer mode='apply_mask'>
     <filter mode='threshold'>
     <grayscalelayer/>
 </layer>
 <layer color='rgb(0.5,0.5,0.2)'/>

<layer name='blue'>
 <layer mode='apply_mask'>
     <filter mode='threshold'>
     <grayscalelayer/>
 </layer>
 <layer color='rgb(0.0,0.0,1.0)'/>

<layer name='violet'>
 <layer mode='apply_mask'>
     <filter mode='threshold'>
     <grayscalelayer/>
 </layer>
 <layer color='rgb(0.0,1.0,1.0)'/>

<layer name='black'>
 <layer mode='apply_mask'>
     <filter mode='threshold'>
     <grayscalelayer/>
 </layer>
 <layer color='rgb(0.0,0.0,0.0)'/>

<layer name='green'>
 <layer mode='apply_mask'>
     <filter mode='threshold'>
     <grayscalelayer/>
 </layer>
 <layer color='rgb(0.0,1.0,0.0)'/>

<layer name='red'>
 <layer mode='apply_mask'>
     <filter mode='threshold'>
     <grayscalelayer/>
 </layer>
 <layer color='rgb(1.0,0.0,0.0)'/>
</layer>
<layer color='rgb(1.0,1.0,1.0)'/>
</layer>
</image>

/Øyvind K.

--
«The future is already here. It's just not very evenly distributed»
                                                -- William Gibson
http://pippin.gimp.org/                            http://ffii.org/
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