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August 2009
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2009.08.27 19:14 "Re: Libtiff 4.4.0beta4 Released", by Frank Warmerdam
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