[QGIS-trac] Re: [Quantum GIS] #996: Re: [Quantum GIS] #996: QGIS corrupts JPEG2000 colors

[Quantum GIS]

#996: Re: [Quantum GIS] #996: QGIS corrupts JPEG2000 colors
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        Reporter:  coatman                           |         Owner:  nobody       
            Type:  defect                            |        Status:  reopened     
        Priority:  major: does not work as expected  |     Milestone:  Version 1.0.1
       Component:  Rasters                           |       Version:  HEAD         
      Resolution:                                    |      Keywords:  kakadu raster
Platform_version:                                    |      Platform:  OS X         
        Must_fix:  No                                |   Status_info:  0            
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Comment (by Coatman):

 Jef, Thanks for reporting your findings.  I think it is now reasonable to
 conclude by a preponderance of the evidence reported here that

 1. When QGIS depends upon a version of GDAL that is older than about 10
 months, then QGIS properly displays JPEG2000 images thru Kakadu and thru
 Jasper

 2. When QGIS depends upon a version of GDAL that is newer than about 10
 months, JP2 images are properly georeferenced, and displayed with the
 proper number of columns and rows, but the colors are altered.  Thru
 Kakadu, the colors appear to be run through a color Look Up Table (LUT).
 Thru Jasper, the colors can be all black.  More examples are at
 http://homepage.mac.com/gregcoats/jp2.html

 In comparing the code in GDAL 1.6.0 to 1.5.0, I find that the Kakadu based
 frmts/jp2kak/jp2kakdataset.cpp in 1.6.0 has different code than 1.5.0
 after the comment in 1.6.0 on line 312 "Figure out the color
 interpretation for this band."
 I find that the Jasper based frmts/jpeg2000/jpeg2000dataset.cpp in 1.6.0
 has different code than 1.5.0 around the comment in 1.6.0 on line 738
 "JPEG2000 driver ignores color table. Consider using color table expansion
 (-expand option in gdal_translate)".

 Jef, If you do not already have Kakadu and are interested (Kakadu is much
 faster than Jasper), then please send contact info to gregcoats at mac.com

 Thanks to everyone for their contributions.  I hope now someone will look
 into GDAL.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/996#comment:44>
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