choosing colors for rasters

[Rod Paterson]

Simon,
     We have partly engineered one using a Tcl/Tk tool that
     is freely available. I can send you a copy if you have
     tcl/tk available on your hardware. It could do with some
     more work as it currently only produces a colour per
     category type colour map. ie it doesn't do ranges

        regards
        Rod Paterson
        Aberfoyle Resources Ltd
        Level 31
        525 Collins Street
        Melbourne Vic., 3000

        Phone: 61-3-92706666
        Fax:   61-3-92706699
        Email: rgp at aberfoyle.oz.au


> A frequent issue when developing GRASS map databases is getting 
> the colours right on raster-maps.  Although there are GRASS programs 
> to manipulate these some ways, I frequently find it (ugly but) 
> effective just to have a go at the MAPSET/colr/MAP file with a 
> text editor!  
> 
> However, this usually requires some guesswork to set the RGB triplets 
> to appear how you want them.  This would be made easier if there was 
> a utility somewhere that displayed a colour-wheel/cone etc and 
> allowed the user to point at a spot and be given the RGB values for 
> that colour.  
> 
> Does anyone know of such a tool?  Xsomething would be best, of course. 
> 
> (I know that you can do it the other way around - specify RGB values 
> and see what it shows - using the colour editor in XV, for example, 
> but such an iterative approach is painful for more than 2 or 3 colours!) 
> -- 
> __________________________________________________
> Dr Simon Cox - Australian Geodynamics Cooperative Research Centre
> CSIRO Exploration & Mining,  PO Box 437,  Nedlands, WA 6009 Australia
> T:  +61 9 389 8421    F:  +61 9 389 1906   simon at ned.dem.csiro.au
> http://www.ned.dem.csiro.au/AGCRC/people/CoxSimon/
> 
>