[Gdal-dev] MrSID driver with 16bit output

[Chapman, Martin]

Frank / Kirk,

My file is UInt16.  Sounds like the same error I get.  Did you check in
your changes?  I'll test it out on my image.

Best regards,
Martin

-----Original Message-----
From: Frank Warmerdam [mailto:fwarmerdam at gmail.com] On Behalf Of Frank
Warmerdam
Sent: Friday, February 17, 2006 9:56 AM
To: Chapman, Martin
Cc: gdal-dev at lists.maptools.org; Kirk McKelvey
Subject: Re: [Gdal-dev] MrSID driver with 16bit output

Chapman, Martin wrote:
> I have a 16bit (GDT_UInt16) tiff file that I am trying to copy to a 
> UInt16 jp2 file using the MrSID esdk 6.x driver.  When I try to remap
it 
> to 8-bit uchar it works fine.  When I try to just copy it to jp2 it 
> fails.  It looks like the only diff between the two operations is the 
> datatype used to initialize the JP2WriterManager object in the 
> JP2CreateCopy() method of the mrsiddataset.cpp file.  In 
> MrSIDDummyImageReader::initialize() the datatype is set to 
> LTI_DATATYPE_UINT16 instead of LTI_DATATYPE_UINT8.  Can anyone confirm

> this to be a problem in the GDAL mrsid driver?

Martin / Kirk,

Could you verify your file is UInt16?  I tried with an Int16 file, and
it crashed.  It turns out I wasn't checking return values from stuff
like the initialize() method, and it was returning an error code
indicating
"unsupported datatype [50903]".  If I force the output type to UInt16
things
seem to work fine.   This was all with Geo_ESDK-5.0.6.962.  Perhaps
behavior
has changed in ESDK 6?

I am going to tighten up the error checking a bunch, but I don't see
much
other action I can take for now.  Kirk can you comment on LTI_DATATYPE_
values that should work with JPEG2000?

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