[gdal-dev] gdal_merge.py -separate failing to create RGB

[mattia]

Hi folks,

I have a problem trying to create RGBs with the gdal_merge.py utility...

Mainly I have some images that I have extracted from HDF4 SDSs and processed
in TIFF format using ImageMagick...

Now a sample image as the following gdalinfo output:

*mattia at mattia-laptop:~/Desktop/rgb$ gdalinfo t2.tif
Driver: GTiff/GeoTIFF
Files: t2.tif
Size is 2708, 9340
Coordinate System is `'
Metadata:
 TIFFTAG_DOCUMENTNAME=AMOD02HKM20070104021601_0_1_band_2_out.tif
 TIFFTAG_SOFTWARE=ImageMagick 6.3.8 02/18/08 Q16 http://www.imagemagick.org
 TIFFTAG_XRESOLUTION=72
 TIFFTAG_YRESOLUTION=72
 TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
Image Structure Metadata:
 INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0, 9340.0)
Upper Right ( 2708.0,    0.0)
Lower Right ( 2708.0, 9340.0)
Center      ( 1354.0, 4670.0)
Band 1 Block=2708x1 Type=UInt16, ColorInterp=Gray*

The file size (for the three images I am trying to merge) is about 50MB..
As you can see its a 16 bit image..

if I run something like:

* gdal_merge.py -separate t1.tif t2.tif t3.tif -o out.tif*

The output image out.tif is still a greyscale where 2 of the bands are
somehow "not recognized"...
The gdalinfo on the output tif is:

*Driver: GTiff/GeoTIFF
Files: out.tif
Size is 2708, 9340
Coordinate System is `'
Image Structure Metadata:
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0, 9340.0)
Upper Right ( 2708.0,    0.0)
Lower Right ( 2708.0, 9340.0)
Center      ( 1354.0, 4670.0)
Band 1 Block=2708x1 Type=UInt16, ColorInterp=Gray
Band 2 Block=2708x1 Type=UInt16, ColorInterp=Undefined
Band 3 Block=2708x1 Type=UInt16, ColorInterp=Undefined
*

Does it have to do with the fact that its a 16 bit image and gdal_merge.py
doesn't support it?
With the fact that ImageMagick has corrupted something ?
Or what exactly is the issue?

Thanks in advance


-- 
Mattia
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