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January 2003
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2003.01.27 03:16 "Re: Are there de facto defaults for resolution (TIFF 6 file) ??", by Martin Bailey
2003.01.27 19:48 "Re: Are there de facto defaults for resolution (TIFF 6 file) ??", by James Belshan2003.01.27 19:48 "Re: Are there de facto defaults for resolution (TIFF 6 file) ??", by James Belshan
> At 20:50 24/01/2003, Michael O'Rourke wrote: > >unfortunately some very odd folks put the resolution into a exif > >block in a tiff and not in the main tag table for a page. sucks, but > >in such circumstances you can only get the right into if you parse > >exif blocks too. > > That's certainly true for JPEG, but the EXIF data is encoded as TIFF > tags anyway - there *is* no EXIF block for TIFF ... > > Martin Thanks for your help, guys. I've now researched the EXIF format a little, and can't find it within my TIF file. The files contain exposure information, though, which to me implies EXIF info. My picture is CCITT bilevel, not JPEG. So my initial thought that EXIF info would be in JPEG-encoded image data within the image data can't be correct. I don't see the EXIF tag (#34665) in IFD 0, and there is no IFD 1. In a nutshell... I'm still lost trying to find this (apparently EXIF) resolution information. But hey, on the bright side, I'm learning how to program image processing programs. James P.S. Here's all the TIF tags for IFD 0, in case you want to see them. Tag #, Tag Name, ValueOffset 256, ImageWidth, 4600 257, ImageLength, 7000 258, BitsPerSample, 1 259, Compression, 4 262, PhotometricInterpretation, 0 273, StripOffsets, 228730 277, SamplesPerPixel, 1 278, RowsPerStrip, 28 279, StripByteCounts, 229730 284, PlanarConfiguration, 1