[gdal-dev] Re: merging rasters setting opacity

[Stefano Iacovella]

I made some further experiments. I managed to get a colour-relief with
gdaldem command, setting the alpha opacity in the color_text_file.
Now I've got two files with the desired output, an hillshade and a
colour-relief.
The next step I'm wondering hot to do is to merge this two representation in
one.
Is there an equivalent form of image magik command composite in gdal?

thank you again for any hint or suggestion

Stefano


2010/7/20 Stefano Iacovella <stefano.iacovella at gmail.com>

> Dear all
>
> sorry for the newbie question. I did some experiments with gdal but I was
> unable gettint to the target.
>
> I have a DTM in ASCII GRID, I produced an hillshade relief with gdaldem
> program and saved the ouput in a tiff file.
> What I would like to do now is to merge this tiff with an other tiff
> containing the DTM with a color ramp rendering. The merge should be done
> setting the opacity of one of the two tiff file to avoid complete
> overriding. I wonder if this could be done creating a vrt dataset of the two
> files and editing the vrt file.
> Any hints?
>
> thanks for your hints
>
> stefano iacovella
>
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