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March 2005
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2005.03.31 10:04 "Re: 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. 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 ). > 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