AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2002.11.08 14:58 "bits/sample & Old-style JPEG", by Frank Sijbers
2002.11.08 15:50 "Read Old-style JPEG", by
2002.11.08 19:29 "Re: Read Old-style JPEG", by Michael Talbot-Wilson

2002.11.08 15:50 "Read Old-style JPEG", by

Which library do you use for read tiff files compress whith jpeg. I have the same error message and I think it comes because I use jpeg6b (may be the last jpeg version).

My idea is: try to unload your jpeg library and load and older library

diana

-----Message d'origine-----
De: Frank Sijbers [mailto:frank.sijbers@amplexor.com]
Date: vendredi 8 novembre 2002 14:58
À: tiff@olympiakos.com
Objet: bits/sample & Old-style JPEG

I'm trying to convert some tiff-images I receive after an scan and OCR operation. Unfortunately this doesn’t seem to work.

 Apparently I have two problems:

  1. Compression Scheme: Old-style JPEG
  2. Some tiff-files have an unsupported compression: Old-Style JPEG
  3. I can’t figure out how to get of that. Does anybody know a tool that remove-unpack- uncompress these images
  4. Bits/Sample: 8

If I convert jpg to tiff (with imagemagick) and try to use compression, I can’t do this because I get a warning: Bits/sample must be 1 for Group 3/4 encoding/decoding. Is there a method to reduce the bits/sample?

Can anybody help me out or at least show me some directions where to start looking?

Thx

 Frank

 (PS I’m sorry if this messages arrives in HTML, I have to use a webmail client.)