[gdal-dev] Creating jpeg compressed tiff with alpha

[Livneh Yehiyam]

Hi
I'm having problems creating a jpeg compressed tif with ARGB pixel format with gdal_translate.
I tried the command
gdal_translate pngWithAlpha.png 3.tif -b 1 -b 2 -b 3 -mask 4 -co alpha=yes -co COMPRESS=JPEG  --config GDAL_TIFF_INTERNAL_MASK YES

as it appears in the gdal_translate documentation, but the image I'm getting doesn't have an alpha channel.
c:\Users\Atlas\Pictures>gdalinfo 3.tif
Driver: GTiff/GeoTIFF
Files: 3.tif
Size is 480, 360
Coordinate System is `'
Image Structure Metadata:
  COMPRESSION=JPEG
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0,  360.0)
Upper Right (  480.0,    0.0)
Lower Right (  480.0,  360.0)
Center      (  240.0,  180.0)
Band 1 Block=480x16 Type=Byte, ColorInterp=Red
  Mask Flags: PER_DATASET
Band 2 Block=480x16 Type=Byte, ColorInterp=Green
  Mask Flags: PER_DATASET
Band 3 Block=480x16 Type=Byte, ColorInterp=Blue
  Mask Flags: PER_DATASET

I also tried without the -mask option, in which case I get errors:
ERROR 1: JPEGLib:Bogus input colorspace
ERROR 1: WriteEncodedTile/Strip() failed.

I'm using gdal 1.9.1 x64 on windows 7 64 bit.

Is there another way to do this, or is it a known limitation of the tiff driver?

Thanks
Yehiyam

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