-
2005.08.04 20:50 "Re: [Tiff] (no subject)", by Joris Van Damme
- 2005.08.17 14:07 "[Tiff] Re: TIFFWriteScanline and G4 compressed block concatenation", by Philip Watkinson
2005.08.17 16:04 "RE: [Tiff] Re: TIFFWriteScanline and G4 compressed block concatenation", by Philip Watkinson
Joris,
I was unable to create a valid CCITT Group 4 image file by concatenating the strips from a CCITT Group 4 TIFF file.
Philip
-----Original Message-----
From: Joris [mailto:joris.at.lebbeke@skynet.be] Sent: Wednesday, August 17, 2005 10:37 AM To: Philip Watkinson; 'TIFF mailing list' Subject: Re: [Tiff] Re: TIFFWriteScanline and G4 compressed block concatenation
You can extract a CCITT Group 4 image from a TIFF file with TIFFReadRawStrip() and create a valid CCITT Group 4 image file provided the image only uses one strip.
Indeed. I hadn't noticed there was ever any doubt about that.
- I want to extract a CCITT Group 4 image from a TIFF file. If I
- obtain the strip offsets using TIFFGetField(), can I concatenate the
- strips together to create a valid CCITT Group 4 image file?
A good way to find out is to try. I'm not enterily sure and would have to double-check, but I don't think you can do that. Two CCITT group 4 compressed blocks, concatenated, is not one valid block I think.
Have you double-checked my suspicion? If so, it would be interesting to read your findings.
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