[gdal-dev] nearblack troubles [SEC=UNCLASSIFIED]

[Even Rouault]

Le jeudi 28 avril 2011 17:49:48, Matt Wilkie a écrit :
>  > Worked for me using the following:
>  > 
>  > #Change black to white
>  > gdalbuildvrt -srcnodata 0 -vrtnodata 255 to-be-decollared.vrt
>  > to-be-decollared.tif
>  > #Run nearblack -white
>  > nearblack -white -o decollared.tif to-be-decollared.vrt
> 
> Luke, once again I thank you. :)

There's one thing you must be aware of with the above process. The 
gdalbuildvrt step will replace all 0 values by 255, but band per band, to be 
opposite to detecting the triplet (0,0,0). So this might alter colors that 
have least one component to 0 inside the raster.

> 
> 
> matt wilkie
> --------------------------------------------
> Geomatics Analyst
> Information Management and Technology
> Yukon Department of Environment
> 10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
> 867-667-8133 Tel * 867-393-7003 Fax
> http://environmentyukon.gov.yk.ca/geomatics/
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