Changes between Version 7 and Version 8 of TIFF12BitJPEG


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Timestamp:
Jun 26, 2009, 12:19:11 PM (15 years ago)
Author:
warmerdam
Comment:

add notes on gdal changes.

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  • TIFF12BitJPEG

    v7 v8  
    5555== GDAL ==
    5656
    57 Currently no changes have been made to GDAL, though it is necessary to build with an external libtiff to use dual mode as the internal libtiff build stuff does not currently support dual mode.  This might change at some point.
     57The internal versions of libtiff, and libjpeg in GDAL have been updated to include the above changes, and in GDAL trunk a default build with internal libtiff and libjpeg should result in 8/12bit dual mode being enabled.  On unix dual mode can be disabled via the --without-jpeg12 switch.  On windows this is controlled by the JPEG12_SETTING value in nmake.opt.  If the setting is commented out dual mode is disabled.
    5858
    5959Reading 12bit files is straightforward.  Generating them requires particular creation options for the GTiff driver, for example: