Andreas Neumann wrote:
Hi,
I am using gdal_merge to merge different rasters. The problem is that the
nodata values appear as black and I want to have them white.
Is there an option to set nodata values to white with gdal_merge? Or would
I have to do this as a postprocessing?
The problem is that the images are too large to be opened in an
interactive application like Photoshop and Gimp. Otherwise I would correct
it in there.
Thanks for an idea on how to add nodata as white to my gdal_merge workflow.
Andreas,
I can't answer this without knowing more about your image configuration
and what applications you are using to judge that the nodata is white.
Does the image have a colormap?
What is the nodata value?
What is the pixel type?
What are typical image values?
If the image does not have a colormap, and the nodata value is larger
than the typical image values, then most applications that don't treat
nodata values specially will just treat them as white or a more intense
value than the rest of the image values.
If the image has a colormap then there may be options available to alter
the colormap, though this will depend on the file format, and perhaps
you capacity to write a small script.
Best regards,
--
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