AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2005.03.22 17:20 "[Tiff] tif_jpeg.c and 12bit JPEG Files", by Frank Warmerdam
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2005.03.22 21:36 "Re: [Tiff] tif_jpeg.c and 12bit JPEG Files", by Bob Friesenhahn
2005.03.31 10:04 "Re[2]: [Tiff] tif_jpeg.c and 12bit JPEG Files", by Jean-Yves Le Ridant
[...]

2005.03.31 10:04 "Re[2]: [Tiff] tif_jpeg.c and 12bit JPEG Files", by Jean-Yves Le Ridant

Hello Bob,

Tuesday, March 22, 2005, 11:36:17 PM, you wrote:

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