more grey levels for XDRIVER?

[Dave Gerdes]

> From: martijn at scanner.frw.uva.nl
>
> Brian Scamman writes:
> > 
> > Is there a way to increase the number of greyscale levels available to the
> > display window?  Currently, I am able to only get six different levels.  I would
> > like to get 256 levels if it is possible.
> > 
> r.colors map=mapname color=rules
> will do the trick if your 'rules' file contains
> 0% 0 0 0
> 100% 256 256 256
> if I'm not mistaken (I haven't tried it myself)
> 
> 
> 

The issue is that in fixed mode, GRAY only gets a few slots in the
color table.  If you switch to float mode: d.colormode float,
you can fill up the entire color table with gray levels.
There are problems with using float mode of course, so consider the risks.


-- 



  Dave Gerdes
  US Army Construction Engineering Research Lab
  Spatial Analysis & Systems Team
  dpgerdes at zorro.cecer.army.mil
  (217) 352-6511 x591