[Gdal-dev] Weird colors in gdal_translate

[Frank Warmerdam]

On 8/30/05, Morten Nielsen <mn at blominfo.dk> wrote:
>  
>  
> 
> I'm sorry if this is a double-post, but I think something went wrong in the
> first email… 
> 
> Anyway, I'm trying to extract tiles from a large image, but all I get is a
> weird-looking image consisting only of rgb levels at either 0 or 255. There
> is an example here: http://blominfo.dk/3d/gdalerror.png 

...
> I'm using "FW Tools 0.9.9". 

Morten, 

I didn't see anything unusual about the image, other than that it is
quite large of course.  Are you using FWTools 0.9.9 on Linux or
Windows?  I don't completely trust the older version of the ECW
library I use on Linux and I am hoping to upgrade again when the
next ECW SDK release comes out. 

Also, could you set the CPL_DEBUG environment variable to ON
and rerun the problem translation and capture all the debug output?
There should be message about the -srcwin that actually gets used
for your projwin, and then various debug messages about what 
GDAL actually does internally. Perhaps some of this will be helpful
in diagnosing the problem. 

Best regards,
-- 
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