[GRASS5] g.pnmcomp and Gamma correction (gis.m slider?)

[Markus Neteler]

On Thu, Mar 16, 2006 at 03:02:56PM +0000, Glynn Clements wrote:
> 
> Markus Neteler wrote:
> 
> > while generating RGB composites, I came across the
> > problem that sometimes maps appear as too dark
> > (also when shading maps).
> > 
> > Glynn, would it be possible to add Gamma correction
> > to g.pnmcomp and, if so,
> 
> Possible: yes. Sensible: no.
> 
> If needed, gamma correction should be applied before the maps are
> rendered, by modifying either the colour table or the cell values
> (probably the former).
> 
> Maybe r.colors needs a gamma= option?

Yes, that sounds reasonable (as well as r.composite).

Markus