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March 2006
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2006.04.02 16:19 "Re: 16-bit TIFF to 8-bit BMP/TIF ???", by Bob Friesenhahn
On Sun, 2 Apr 2006, Chris L. wrote: > > Sorry for the late reply. What I am getting with most > software packages is an entirely black image. Is there > a way of veiwing the data form teh 16-bit unsigned > TIFF without libtiff automatically converting to 8-bit > i.e. view 16-bit data? I can manually convert all > values using a square root (changing into the desired > 8-bit 0-255 whilst keeping proportions). > > This may be a slow memory inefficient method but at > this stage I would like this functionality. The libtiff APIs provide support for accessing the original values but I don't know that anything more than 8-bits is available from the libtiff utilities. You might try GraphicsMagick (http://www.GraphicsMagick.org/) which is able to retrieve 16-bit TIFF data without any problem and provides a number of algorithms you could use to convert to 8-bit data. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/