2001.03.21 17:14 "Re: Wang tiff", by Helge Blischke
Neil Durant <email@example.com> writes
A colleague has given me a very large number of tiff files that he generated from a scanner with the software that came with that, and it seems that they are not in a TIFF format I can load into conventional graphics packages such as Paint Shop Pro. A bit of investigation has revealed that they are "Wang TIFF" files.
I need to convert them into JPEG format, but the only way I have found so far is using the "Imaging" program that comes with Windows NT, to convert them first to BMP and then on to JPEG in a separate application. However the BMP files are 24 Mb in size (from 200kb TIFF files), and the whole process is taking forever (I have hundreds of images to convert).
Does anyone know of some tool I can use to convert these Wang TIFFs to JPEG directly, and also ideally do it in some kind of "batch" mode, so I can leave it churning on the whole set of files?
I've managed to glean a bit more info about my strange TIFF files, using
a Linux tool called TIFFINFO. This is what it says:
Image Width: 3640 Image Length: 2460
Resolution: 600, 600 pixels/inch
Compression Scheme: Old-style JPEG
Photometric Interpretation: YCbCr
YCbCr Subsampling: 2, 1
Software: "Oi/GFS, writer v00.06.01P"
Orientation: row 0 top, col 0 lhs
Planar Configuration: single image plane
Hope this might trigger an idea in someone's mind about how I can
convert these files to a more standard format (JPEG, or even standard
Well, this is what I found out as well.
As the TIFF V6 spec is partly ambiguous on (old style) JPEG compression, you'd need
to know how the Wang people actually did the implementation (or do lots of reverse
engeneering experiments). I guess there isn't much help in the short run.