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Date: Thu, 27 Aug 2009 15:14:29 -0400
From: Frank Warmerdam <warmerdam@pobox.com>
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To: Edward Lam <edward@sidefx.com>
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Cc: Tiff List <tiff@lists.maptools.org>
Subject: Re: [Tiff] Libtiff 4.4.0beta4 Released
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Edward Lam wrote:
> Hi,
> 
> Bob Friesenhahn wrote:
>> 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,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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