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June 2004
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2004.07.06 03:47 "Re: Floating point tags and cross-platform", by Andrey Kiselev
On Fri, Jun 25, 2004 at 12:26:13PM -0400, Torborg, Alan wrote: > I am trying to read tags of type double from tiff images that were > created on a PC. I'm trying to read the tags with version 3.6.1 of > LIBTiff on a Strong-Arm processor running Linux. What I can recommend in first of all is to try the 3.7.0alpha (or, better, CVS version of libtiff). I'm very interested in testing before the new release. > Unfortunately - I am getting garbage from the tags. I'm assuming this > is an issue with different floating point standards. Actually, the > strong arm processor does not have a floating point processor - so we > are using a floating point emulator (nwfpe) that, at this point, I > know very little about. I do know that the emulator is supposed to be > using IEEE floating point standard (similar to PC). I'm probably know even less then you, but I can imagine that you need do the following: 1. Undefine HAVE_IEEEFP macro in the config.h file (tiffconf.h for 3.6.1). 2. Write floating point conversion routines, specific for your platform. You can find the samples of such routines in the tif_vms.c module. Such routine will be called every time libtiff will read a float value from file. Andrey -- Andrey V. Kiselev Home phone: +7 812 5274898 ICQ# 26871517