[gdal-dev] GeoEye-1 NITF - Warning 1: Image with 11 bits per sample will not be interpreted properly

[Frank Warmerdam]

On Tue, Aug 11, 2009 at 12:17 PM, Gong, Shawn
(Contractor)<Shawn.Gong at drdc-rddc.gc.ca> wrote:
> hi list,
>
> I found help clues to build libecwj2 on Windows.

Shawn,

Congrats on working though this issue!  Perhaps you would like to add
some notes to:

  http://trac.osgeo.org/gdal/wiki/ECW

> However when I tried to open GeoEye-1 NITF, I got “Warning 1: Image with 11
> bits per sample will not be interpreted properly”.

I thought there were changes in trunk to avoid this warning when the
image is jpeg2000 and being handled by a suitable codec.  However,
I think I only tested this specific issue when using JP2KAK for the
jpeg2000 support.  I'm not sure if there are problems with the ecw sdk
and such files or not.  However, the note about being badly corrupted
should not really apply.

> There are two sub-datasets in NITF (please see the gdalinfo at the end). If
> I open the 2nd sub-dataset, the data show only 73 pixels and 220 lines;
> digital numbers are either 0 or 255.

Hmm, I don't know why it would be particularly small in size.
I'm also surprised that the latest windows fwtools has problems.
Perhaps you could file a ticket on the issue and I could look into
it a bit next week (especially since problems can be reproduced
with FWTools which I think uses JP2KAK for this purpose).

Hmm, on second thought, I believe I removed JP2KAK from
FWTools for licensing reasons - so perhaps it is using the
ecw jpeg2000 driver too.

Best regards,
-- 
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