[GRASSLIST:5562] Re: i.composite problem: gives minmax 1:1, grass5

[Philipp Molzer]

Hi,
Thanks. Unfortunately, d.rgb gives me an image with quite bizarre 
colors. What I really want
is to produce an image like the one displayed in i.colors, which does a 
great job with the colors.
I'm trying to create a baselayer for some vector data overlays, so I 
want to create a single raster
layer that I can then "fade out" to make a more subtle background.
Phil

Eric G. Miller wrote:

>On Fri, Feb 14, 2003 at 08:17:25PM -0500, Philipp Molzer wrote:
>  
>
>>Hi,
>>Running grass5 on Linux RH8, I've imported a USGS aerial photo in JPEG 
>>format with
>>
>>r.in.gdal -o input=294.JPG output=294.JPG
>>
>>This gives me an imagery group called 294.JPG
>>and 3 raster files called 294.JPG.1, 294.JPG.2, and 294.JPG.3
>>Each of the raster files has a data range of 0..255 and is viewable with 
>>d.rast
>>I'd like to plot the image with proper colors with d.rast so I first ran
>>g.region rast=294.JPG.1
>>r.support -r map=294.JPG.1
>>r.support -r map=294.JPG.2
>>r.support -r map=294.JPG.3
>>and then
>>i.composite (interactively) on 294.JPG, choosing
>>b=294.JPG.1
>>g=294.JPG.2
>>r=294.JPG.3
>>colorsteps=10
>>output=294.JPG.COMP
>>This did give me a decent color table with a range of 1..1000
>>
>>The problem is that 294.JPG.COMP has a data range of 1..1
>>so I get a blank image.
>>
>>What am I doing wrong?
>>    
>>
>
>I don't know what the problem is, but I think you'll 
>be happier just using d.rgb.
>
>  
>