[GRASSLIST:1078] Re: r.in.tiff and r.composite

[Glynn Clements]

Luis Goncalves Seco wrote:

> I whould like to understand the logic of have two commands 
> for import a tiff image in a single GRASS file?
> 
> Because r.in.tiff generate 3 files (r,g,b), I whould like 
> to know if the ideia of the programmer, was permit that 
>  the user could adjust (1-256) each color with 
> r.composite?
> if not why? and why not 2 commands in one, if we have 
> programs like Gimp to do this before importing?

An RGB image has three values per cell (pixel): red, green and blue. 
GRASS raster maps only have one value per cell, so you need to create
three maps to hold all of the information.

-- 
Glynn Clements <glynn.clements at virgin.net>