2005.03.22 17:20 "[Tiff] tif_jpeg.c and 12bit JPEG Files", by Frank
Warmerdam
Thread
2005.03.31 10:04 "Re[2]: [Tiff] tif_jpeg.c and 12bit JPEG Files", by Jean-Yves Le Ridant
Hello Bob,
They are clearly used for remote sensing applications. Intergraph's software supports it.
4:2:2 YUV 10 bit per sample tiled files with MPEG2 compression is a / the standard... In the same "universe" that has driven baseline JPEG in 70/80.
I don't range all those people, trading much resolution and a decent color depth against a slight compression loss, in decerebrated idiots class.
12 bit JPEG in TIFF files were first reported on this list to be "in the wild" about a year ago.
For my use, the question of bit depth that is somewhat "of the past" is less a concern than colorimetrics definition and handling, in tiff and in particular jpegtiff. Typical: on one hand, a RGB TIF with/without tiff colorimetrics tags embedded profile. On the other hand, jpeg YCC with/without chroma downsampling, colorimetric tags, profiles.... Jpeglib - Libtiff - readers - writers who handle what? I mean theory, design...., wanted expected imposed... ( for state of art, sources are online ).
I expect that there are many exotic TIFF formats in use that Photoshop will never support.
One who deal with exotics formats will deal to feed a wiewver with whatever it want. Use old Adobe SDK to add correct suppport for cielab pyramidal jpegtiff files to PSP, for example.
Jean-Yves