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August 2005
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2005.08.29 16:57 "libTIFF and ImageMagick - Windows binaries; Turning on support for JPEG compressed TIFFs; Alternatives (TIFFCP, TIFF2BW, etc.) for JPEG TIFFs", by <dave_roberts@farmfamily.com>
We use ImageMagick (which contains a copy of libTIFF) to process images of various formats and compressions into either Group4 (B&W)TIFF or JPEGs depending on content. I got a "Sorry, Compression Method is Not Configured" error message in ImageMagick for JPEG compressed TIFFs, so I took a look at the source code distribution (for 6.2.4) for the Windows build. I noticed that in the "tifconf.h" header file that the JPEG support was defined in the compression section but was in the feature section. I added the #DEFINE statement for JPEG support (and even turned on a setting in ImageMagick's "\tiff\configure" file) and recompiled ImageMagick but it still doesn't work - same error message. Is there some "trick" to getting this to correcly compile? I suspect it might need OJPEG support, but when I turn that on (#DEFINE) in "tifconf.h" I get a compile error. One of my fallback plans would be to identify the file using ImageMagick and if it's a TIFF then use tiffcp or tiff2bw to do the work, but on trying them I get a "Old Style JPEG compression support not enabled message" in the latest binaries (3.73) FYI - The old Wang/Kodak "Imaging for Windows" control can read this file without issue, Any help would be appreciated. Dave