2002.05.01 16:10 "format is invalid or not supported..", by Dustin Puryear
We are using Hylafax, which dumps received faxes as tiff images. In a very small minority of the images, we get an "Invalid compression type" in the Windows Kodac viewer. Okay, I've read that Kodac does not support 2-D MR compressed tiffs. (But then why don't all images produce this error?) If I try to convert the images using tiffcp -c or, in fact, if I just copy the tiff using tiffcp at all, I then get "The document's format is invalid or not supported" when viewing the image. Also, tiffcp gives me a warning message. Does this simply mean the tiff image is corrupted on the page that produces that error message, or is there something we can do to fix these images?
Here is what happens:
$ tiffcp bad_invalid_compression_type.tiff n.tiff bad_invalid_compression_type.tiff: 0: Invalid strip byte count, strip 0.
If I open n.tiff I get the "The document's format is invalid or not supported" error message. If I try:
$ tiffcp -c g3:1d bad_invalid_compression_type.tiff n.tiff bad_invalid_compression_type.tiff: 0: Invalid strip byte count, strip 0.
I get the same error. Notice in the first one I didn't even change the compression type.
If I just open bad_invalid_compression_type.tiff then I get the "Invalid compression type" error.
Dustin Puryear <firstname.lastname@example.org>
UNIX and Network Consultant
PGP Key available at http://www.us.pgp.net
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