2009.08.27 19:14 "Re: [Tiff] Libtiff 4.4.0beta4 Released", by Frank Warmerdam

Libtiff 4.0.0beta4 is now released. Please read about it at http://www.remotesensing.org/libtiff/v4.0.0.html.

There's a new JPEG_DUAL_MODE_8_12 define, but it is only mentioned in the tif_config.h and NOT in the other platform specific versions like:

       tif_config.h-vms tif_config.vc.h tif_config.wince.h

It would be nice if it was alse mentioned in those files as well.

So this brings up a second issue. Is the code for this define safe to enable when compiling libtiff for general purpose usage? What are its requirements? Is libjpeg6b enough?

Edward,

I would note that the JPEG_DUAL_MODE support is for both 8bit and 12bit jpeg in tiff. It is unrelated to "old jpeg" mode. The effort is discussed at:

   http://trac.osgeo.org/gdal/wiki/TIFF12BitJPEG

It requires the latest libjpeg code from the libjpeg.sourceforge.net cvs repository which may be considered a fork outside of the independent jpeg group of jpeg 6b for maintenance purposes.

It is desirable to better describe this functionality in the libtiff docs if there is interest; however, outside the geospatial community I haven't heard of much interest in 12bit jpeg in tiff.

Best regards,
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