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June 1999

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1999.06.10 15:16 "What kind of TIFF is this?", by Eric Wadsworth
1999.06.10 15:50 "Re: What kind of TIFF is this?", by Helge Blischke

1999.06.10 15:50 "Re: What kind of TIFF is this?", by Helge Blischke

Eric Wadsworth wrote:
> 
> Greetings,
> 
> I am working with some 3d software that allows the placement of textures
> 
> onto surfaces. Unfortunately, the only textures that seem to work are
> the ones that came with the 3d software. Anything I produce fails.
> 
> I tried opening this TIFF (link below) in Adobe Photoshop (WinNT) v5.0,
> then saving under a different name (yes, I tried all 4 possible setting
> combinations). The newly saved file refuses to be accepted, even though
> I didn't make any changes. The original file works. A byte-to-byte
> comparison of the two files reveals that they are very different. It
> seems that Photoshop is changing stuff, which results in an invalid file
> 
> format (as perceived by my 3d software).
> 
> How can I produce TIFF files in same format that this one is? Or at
> least identify what the specifics are? Any help would be greatly
> appreciated.
> 
> Here is a link to the example TIFF file:
> http://www.azwebnet.com/wad/bmarble.tif
> 
I checked the sample image (bmarble.tif); it's a pretty normal one. Here
is the
information displayed by tiffinfo and tiffdump, respectively:

TIFF Directory at offset 0xc008
  Image Width: 128 Image Length: 128
  Bits/Sample: 8
  Compression Scheme: none
  Photometric Interpretation: RGB color
  Orientation: row 0 top, col 0 lhs
  Samples/Pixel: 3
  Rows/Strip: 21
  Planar Configuration: single image plane

Magic: 0x4d4d <big-endian> Version: 0x2a
Directory 0: offset 49160 (0xc008) next 0 (0)
ImageWidth (256) SHORT (3) 1<128>
ImageLength (257) SHORT (3) 1<128>
BitsPerSample (258) SHORT (3) 3<8 8 8>
Compression (259) SHORT (3) 1<1>
Photometric (262) SHORT (3) 1<2>
StripOffsets (273) LONG (4) 7<8 8072 16136 24200 32264 40328 48392>
Orientation (274) SHORT (3) 1<1>
SamplesPerPixel (277) SHORT (3) 1<3>
RowsPerStrip (278) LONG (4) 1<21>
StripByteCounts (279) LONG (4) 7<8064 8064 8064 8064 8064 8064 768>
PlanarConfig (284) SHORT (3) 1<1>

It displays fine as well.
I suppose the TIFF interpreter your 3d software uses is broken -- either
it insists in MM (Motorola/Mac) format as your sample, and Photoshop
creates
an II (Intel) format, or your software can't cope with the private
tag(s) Photoshop
inserts into the TIFF IFD.
I'd suggest to hack a bastard of the tiffcp utility that in included in
the
libtiff distribution to constrain the IFD to exactly those tags as in
the sample
file.

Helge

-- 
H.Blischke@srz-berlin.de
H.Blischke@srz-berlin.com
H.Blischke@acm.org