[Gdal-dev] Writing 8-bit TIFFs using JPEG compression

[Frank Warmerdam]

Ray Gardener wrote:
> Has anyone been able to write 8-bit grayscale TIFFs using JPEG 
> compression? I'm running into an issue where libtiff aborts because the 
> photometric interpretation is invalid, even if min_is_black is used. 
> Seems the JCS_GRAYSCALE flag never gets set by the driver. Using the 
> JPEG driver itself is okay.

Ray,

I just tried it and it seemed to work, though I see the following
debug message, which I find suspicious:

GTiff: Setting JPEGCOLORMODE_RGB

Some of the jpeg stuff is very sensitive to the version of libtiff.  Are you
using the builtin libtiff?  The last public release?  libtiff-3.9 from CVS?

Best regards,
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