[gdal-dev] Colored images from grayscale images.

[Belaid MOA]

Thanks a lot Even. I looked at the gdaldem doc and it seems it does some kind of blending to the image.
Unfortunately, I do not want to produce any extra information/distortion in the image; only associate ranges to colors. The ranges form a partition of the pixel values. So, no interpolation/blending is needed. Is gdaldem easy to change to do this?

With best regards.
Belaid Moa.


> From: even.rouault at mines-paris.org
> To: gdal-dev at lists.osgeo.org
> Subject: Re: [gdal-dev] Colored images from grayscale images.
> Date: Wed, 8 Jul 2009 20:02:07 +0200
> CC: belaid_moa at hotmail.com
> 
> You might want to try gdaldem with the color-relief mode to associate RGB 
> values to pixel values. See http://gdal.org/gdaldem.html.
> 
> But this will not set metadata. Otherwise you might want to try MapServer if 
> you want a nice looking map with a legend.
> 
> Le Wednesday 08 July 2009 19:33:34 Belaid MOA, vous avez écrit :
> > Hi everyone,
> >   Is there any easy way to do the following using C++ in GDAL: I have a
> > floating-point image and I'd like to associate arbitrary colors with ranges
> > of the pixel levels. For example: for the pixel values in [0,0.1) associate
> > red, for [0.1, 0.2) associated orange, for [0.2, 0.3) associate light blue,
> > for [0.3,0.4) associate dark blue, for [0.4, 0.5) associate green, etc. I
> > would like also to have this information available in the metadata or as
> > legend so that users know what the colors stand for when they view the
> > image.
> >
> >  Thanks a lot in advance for any input.
> >
> >  With best regards.
> > Belaid Moa.
> >
> >
> >
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