[gdal-dev] gdaldem color-relief geotiff alpha band nv value not working

[Even Rouault]

Le jeudi 17 novembre 2011 21:48:52, Hailey Eckstrand a écrit :
> Hi All,
> 
> I am trying to create an RGBA geotiff using gdaldem color-relief. When I
> load the output geotiff into QGIS, all the NoData values appear black, so I
> loaded the geotiff into R (using rgdal) and all the values in the the alpha
> band are 255, none are 0.
> What am I doing wrong? Thanks in advance,
> Hailey
> 

I don't see anything that would be obviously wrong. Sorry for the question, 
but are you sure that your input dataset has indeed pixels at the nodata value 
? Otherwise could you share your input dataset or a link to it ?