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()?
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
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