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TIFF and LibTiff Mail List Archive

Thread

1994.12.15 05:34 "TIFF File Naming Conventions/Standards?", by Clark Brady
1994.12.15 14:24 "Re: TIFF File Naming Conventions/Standards?", by Bill Davis
1994.12.16 07:41 "Re: TIFF File Naming Conventions/Standards?", by Karsten Spang
1994.12.16 17:39 "Re: TIFF File Naming... Multiple images/file", by Jeremy Shaw
1994.12.17 06:24 "Re: TIFF File Naming Conventions/Standards?", by Clark Brady

1994.12.16 07:41 "Re: TIFF File Naming Conventions/Standards?", by Karsten Spang

The problem with multiple images for TIFF is that the format was designed for a single image. The name says it all: the I stands for Image instead of document, image group, etc.

When there are multiple images in a single file, the standard is clear that they are variations of a single image. Only the first one must be read by a compliant TIFF reader.

That really depends on the subfile type of the IFD. The spec:

   NewSubfileType (254)
   ...
   Bit 1 is 1 if the image is a single page of a multi-page image (See the
   PageNumber field description.)...

   ...

   PageNumber (297)
   ...
   This field is used to specify page numbers of a multiple page (e.g.
   facsimile) document...

That is all you need to put multiple images in a single TIFF file. Any reader that handles multiple pages ought to be able to read such a TIFF file.

It is quite another topic how you update a single page of such a document...

                            Karsten
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E-mail: krs@kampsax.dk                                      Karsten Spang
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