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2002.01.20 06:25 "TIFF files from Photoshop 6", by Jeffrey McArthur
2002.01.21 05:37 "Re: TIFF files from Photoshop 6", by ldk

2002.01.20 06:25 "TIFF files from Photoshop 6", by Jeffrey McArthur

If you run PDFTeX, which uses the libtiff library, and try and include a TIFF file generated by Photoshop 6 you get a pop-up dialog:

"Unknown field with tag 37724 (0x935c) ignored"

I did a little research, and found the following information:

>Photoshop 6.0 uses 4 more tags that are not defined in the TIFF v6 >specification. They are: tSubIFD (330), tJPEGTables (347), tImageSourceData >(37724), and tAnnotations (50255). tSubIFD is documented in the TIFFPM6. >pdf file as a PageMaker extension. tAnnotations are discussed earlier in >this chapter, the TIFF tag does not include the first 12 bytes of the >Annotation. The details for the remaining tags are in the tables at the end >of this section.

>tImageSourceData is a null-terminated string identifying the type of data in >the tag followed by the data for the tag. See the tagged resources found >earlier in this document.

That description is found on page 42 of Adobe Photoshop 6.0 File Format Specification which was found at:

http://partners.adobe.com/asn/developer/gapsdk/download/ps6ffspecsv2.pdf

The tag is not part of the TIFF v6 spec, but it is documented by Adobe. How do I go about getting someone to change the TIFF libraries so that this no longer generates a warning dialog?

    Jeffrey M\kern-.05em\raise.5ex\hbox{\b c}\kern-.05emArthur
    a.k.a. Jeffrey McArthur ATLIS Publishing Services
    http://members.home.net/jeffmcarthur/