[Gdal-dev] NITF and colorinterp

[Peng Gao]

I got the following for gdalinfo -mm

Band 1 Block=640x480 Type=Byte, ColorInterp=YCbCr_Y
  ERROR 6: Unsupported imagery compression format C3 in NITF library.
ERROR 1: IReadBlock failed at X offset 0, Y offset 0
  Computed Min/Max=0.000,0.000
Band 2 Block=640x480 Type=Byte, ColorInterp=YCbCr_Cb
  ERROR 6: Unsupported imagery compression format C3 in NITF library.
ERROR 1: IReadBlock failed at X offset 0, Y offset 0
  Computed Min/Max=0.000,0.000
Band 3 Block=640x480 Type=Byte, ColorInterp=YCbCr_Cr
  ERROR 6: Unsupported imagery compression format C3 in NITF library.
ERROR 1: IReadBlock failed at X offset 0, Y offset 0
  Computed Min/Max=0.000,0.000

What's C3 compression?

> -----Original Message-----
> From: Frank Warmerdam [mailto:fwarmerdam at gmail.com]
> Sent: Thursday, March 17, 2005 11:33 AM
> To: Peng Gao
> Cc: GDAL-dev list
> Subject: Re: [Gdal-dev] NITF and colorinterp
> 
> 
> On Thu, 17 Mar 2005 11:16:39 -0800, Peng Gao <pgao at esri.com> wrote:
> > Thanks Frank.
> > 
> > Converting to RGB is what I am hoping for. Seems like the 
> null pixel block
> > is caused by compression. I can't find compression info. Here is
> > the dump from gdalinfo:
> 
> Peng,
> 
> Dang, I see the GDAL metadata does not include the compression
> code.  I have committed a change to nitfdataset.cpp to 
> include reporting
> the IC and IMODE values as metadata.   If the file is JPEG compressed
> you should see it as IC=C8. 
> 
> Also, do you not get any error message issued when you get NULL 
> back from the GetBlock() call? When I issue "gdalinfo -mm test.ntf" 
> on the commandline for a JPEG compressed file I get the following
> message:
> 
> ERROR 6: Unsupported imagery compression format C3 in NITF library.
> 
> Best regards,
> --
> ---------------------------------------+----------------------
> ----------------
> I set the clouds in motion - turn up   | Frank Warmerdam, 
> warmerdam at pobox.com
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>