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To: Henri Schueler <hschuele@comnetix.com>
Subject: TIFF 6.0 JPEG or OJPEG_SUPPORT
Cc: tiff@fddi-sgi.engr.sgi.com
Date: Tue, 11 Feb 97 19:56:46 PST
From: Ali Ozer <Ali_Ozer@next.com>
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Status: R

You could try decompressing them on a NeXT... They should load OK.

BTW, you should note that there are two "old jpeg TIFF" formats on the NeXT;  
one is real old, using all sorts of tags obsoleted in 6.0, and one is based on  
the early drafts of 6.0. Here are the tags:

The "real old":

Directory at 0x19bfa
  Image Width: 530 Image Length: 799
  Tile Width: 544 Tile Length: 800
  Resolution: 144, 144
  Resolution Unit: pixels/inch
  Bits/Sample: 8
  Compression Scheme: NeXTstep 2.0 JPEG encoding (32865)
  Photometric Interpretation: RGB color
  JPEG Processing Mode: 0 (0x0)
  JPEG Restart Interval: (no restart markers)
  Samples/Pixel: 3
  Number of Tiles: 1
  Planar Configuration: Not planar

The early 6.0:

Directory at 0x1a940
  Image Width: 530 Image Length: 799
  Tile Width: 544 Tile Length: 256
  Resolution: 144, 144
  Resolution Unit: pixels/inch
  Bits/Sample: 8
  Compression Scheme: JPEG encoding (6)
  Photometric Interpretation: RGB color
  YCbCr Subsampling: 2, 2
  YCbCr Coefficients: 0.299, 0.587, 0.114
  JPEG Processing Mode: baseline sequential algorithm
  JPEG Quantization Tables: (present)
  JPEG DC Tables: (present)
  JPEG AC Tables: (present)
  Samples/Pixel: 3
  Number of Tiles: 4
  Planar Configuration: Not planar
  Reference Black/White: 16, 235 , 128, 240 , 128, 240

I can't come up with more details without much research...

Ali



Begin forwarded message:

From: Henri Schueler <hschuele@Comnetix.COM>
Date: Tue, 11 Feb 1997 19:23:43 -0500
To: tiff@fddi-sgi.engr.sgi.com
Subject: TIFF 6.0 JPEG or OJPEG_SUPPORT
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Comnetix.COM!hschuele using -f

I have some jpeg tiff images that were created on a NeXTStep computer.

tiffutil tells me they are 'Old-style JPEG', which is what I expect.


I'm not able to build the software in a way to read them.
(I'd like to convert them to some other form.)

I have seen my way to adding JPEG_SUPPORT and OJPEG_SUPPORT to the code,
but I end up with an unsatisfied reference to TIFFinitOJPEG function during
the link.

Any suggestions?

J.Henri Schueler
Comnetix Computer Systems
1-905-274-4060


