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1996.12.08 13:53 "NCR TIFF to TIFF conversion help...", by Michael J Callahan
1996.12.08 16:35 "Re: NCR TIFF to TIFF conversion help...", by Helge Blischke

1996.12.08 13:53 "NCR TIFF to TIFF conversion help...", by Michael J Callahan

I have to convert NCR TIFF format images to 'standard' TIFF
format images, writing in C. I have some source code which
claims to do this conversion. After conversion the TIFF image
has the following 2 problems I am aware of (and note that the
orientation value of image is 3).

Using XV under Linux, the image loads and displays without
any warning issued. The problem is the image is reversed
horizontally, with the right side on the left and vice versa.
Vertically the display is correct. How can I reverse the
image horizontally? I have tried settings 1-8 on the tagvalue
for orientation, and the image will flip upside down, but none
of the values will cause a right to left flip. That seems very
strange to me! I have picked up the specs for both version 4 
and version 5, the file I'm writing looks correct by these.

The image will not load and display under Lviewpro on NT, with
the error msg 'Unknown data compression algorithm 4(0x4)'. What
can I do with regards to uncompressing using the unknown
algorithym, and then save using a different compression type?
Is that my only/best solution?

Can anyone give me any help with this? Is there information
and/or source code available covering this area? What would be
a good book on this and similar questions? I have little
flexibility with regard to image format or compression since
these images have to be used by an existing business system.

Thanks in advance...

mikec@america.net