[Gdal-dev] PCT and ECW

[Frank Warmerdam]

Andrew Williams wrote:
> Dear all,
> I have a problem with a group of images that have PCT's
>  
> I've mosaicked them and needed to set the -pct option otherwise they came out very dark and murky.
>  
> What I want to do is gdal_translate them to ECW
>  
> When I do this I get the following error
>  
> ERROR 6: SetColorTable() Not supported by this dataset.
> ERROR 5: Destination Band 1 appears to be read-only.

Andrew,

ECW does not support colormapped images (as far as I know).  You will need
to directly encode the color table.  That is turn the one band + PCT images
into 3 band RGB images.  This can be accomplished with the pct2rgb.py python
script if you have GDAL built with python support.

Best regards,
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