[Gdal-dev] Conversion of paletted PNG to ECW does not work

[Frank Warmerdam]

Brent Fraser wrote:
> Frank,
> 
>    I don't think ECW supports palettes.  As a work-around we
> can convert the files to 24-bit then ECW, so no big problem.
> 
>     My thought was the same as the original poster's: either
> have GDAL do the 8-bit to 24-bit conversion as part of the
> format translation (for convenience and to save on temporary
> disk space), or at least produce a warning message that
> paletted files are not supported (this would save time on
> user support!)

Brent,

I agree that ECWCreateCopy() should issue a warning (or if bStrict
is TRUE an error) if a palette is present on the source image.

If you file a bug, I'll "grow the scope" a bit to cover some other
common drivers, and queue it for Mateusz to work on.  Many of the
CreateCopy() implementations are pretty quiet about the information
the ignore.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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