Glynn Clements wrote:
For integer maps, you can create a reclass map using r.reclass. This has much lower overhead than creating a complete new map with r.mapcalc.
That is exactly what I was looking for (thanks!). Glynn Clements wrote:
Are you talking about simply specifying colours in HSB, and keeping the internal data in RGB, or having interpolation performed in HSB space? The former wouldn't be particularly involved; just an extension to G_parse_color_rule(). OTOH, you can obtain this functionality by pre-processing the rules with a script.
I was thinking of all interpolations in HSB space. However your first option (calculating RGB values from specified HSB colors but continuing to work in RGB space) would meet my current need. In fact, that is exactly what I have been doing, but externally to GRASS because I don't know how to write the script for HSB => RGB conversion. I would find this capability to be a useful enhancement of r.colors.
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