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Date: Thu, 31 Mar 2005 12:04:58 +0200
From: Jean-Yves Le Ridant <jean-yves.leridant@culture.gouv.fr>
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Subject: Re[2]: [Tiff] tif_jpeg.c and 12bit JPEG Files
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Status:   

Hello Bob,

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

BF> On Tue, 22 Mar 2005, Chris Cox wrote:

BF> They are clearly used for remote sensing applications.  Intergraph's
BF> 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.

BF> 12 bit JPEG in TIFF files were first reported on this list to be "in
BF> 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 ).

BF> I expect that there are many exotic TIFF formats in use that Photoshop
BF> 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


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