Le mercredi 15 octobre 2014 22:03:32, Paul Hasenohr a écrit : > Hello Even, > > Thank you for your answer. > > In fact in my case, this 4th band is for a Near Infra Red channel so I > definitely do not want to have it labelled as alpha! > But I will have other satellite images with more than 4 bands (plus > possibly an alpha band). Would it be possible to simply remove this > check on the number of bands in CreateCopy()?
Yes, that should be possible. Please file a ticket in Trac about that. > > Thanks, > Paul > > On 15/10/14 21:48, Even Rouault wrote: > > Le mercredi 15 octobre 2014 21:19:37, Paul Hasenohr a écrit : > >> Hello, > >> > >> I just compiled gdal-1.11.1 with support for jpeg2000 through OpenJPEG > >> and wanted to convert a 4 bands TIFF file (with LZW compression) into a > >> lossless JP2 file. > >> While attempting to run gdal_translate, I received this error message > >> ERROR 6: Unable to export files with 4 bands > >> > >> Looking at the file openjpegdataset.cpp [1], it seems that CreateCopy() > >> only supports 1 band and 3 bands files. The option for 4 bands is even > >> commented out. What is the reason for this? > >> Would it be possible to support the creation of JPEG2000 of any number > >> of bands? > >> Can I safely enable the creation of 4 bands files? > > > > I tested that recently and it mostly works except that the alpha band is > > not correctly declared as alpha band, so other JPEG2000 codecs will see > > it as a "unknown" band. I couldn't find in the openjpeg API how to > > declare an alpha band. This would likely involved writing the > > appropriate information in a JP2 box. > > > >> I want to create GMLJP2 files as it is one option suggested by the > >> INSPIRE technical guidelines on orthoimagery and I would like to use > >> GDAL for this. > >> > >> Thank you for your support. > >> > >> Best regards, > >> Paul Hasenohr > >> > >> [1] > >> https://svn.osgeo.org/gdal/trunk/gdal/frmts/openjpeg/openjpegdataset.cpp > >> _______________________________________________ > >> gdal-dev mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
