2007.02.05 03:28 "[Tiff] Request help On OJPEG Compression In Libtiff", by
Steven Lim
Thread
2007.02.05 18:19 "RE: [Tiff] Request help On OJPEG Compression In Libtiff", by Chris Cox
- Don't do that
- REALLY, don't do that -- the old JPEG encoding is rarely supported (I'm sorely tempted to add a more severe note to Photoshop when encountering them to say that the file is buggy and the user needs to complain to the vendor that wrote it).
- You can convert a JFIF image to TIFF a lot easier using compression 7 instead of the obsolete compression 6.
-----Original Message-----
From: tiff-bounces@lists.maptools.org on behalf of Steven Lim
I have grab a copy of libtiff from CVS and built it under MSYS & MinGW environment with jpeg support enable(Told by Joris that the OJPEG will be enable as well once the jpeg support is enable).
But how do i need to do in order to use the Old Jpeg Compression? The version of libtiff i grab it from CVS and it's said no required hack on libjpeg, and i try just to use it by calling TIFFSetField(tiffout, TIFFTAG_COMPRESSION, COMPRESSION_OJPEG), and this seem not correct.
And it's give me the below warning message: "Compression
algorithm does not support random access". Currently what i intend to do is
convert a jpeg image to tiff by using the OJPEG compression algorithm.Thanks in advanced.