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diff --git a/doc/terms.rst b/doc/terms.rst index d20d80ed..3d4012a6 100644 --- a/doc/terms.rst +++ b/doc/terms.rst @@ -35,6 +35,31 @@ Codec: Software that implements the decoding and encoding algorithms of a compression scheme. +.. _ImageFileDirectory: + +Image File Directory (IFD): + An Image File Directory - in short also *directory* - + contains information about the image, + as well as pointers (offsets) to the actual image data + within the on-disk file. + An IFD points either to the next IFD or shows with a ''0'' + that it is the last IFD in the IFD-chain. + +Multi Images per TIFF file: + There may be more than one IFD in a TIFF file. + Each IFD defines a *subfile*. + One potential use of *subfiles* is to describe related images, + such as the pages of a facsimile transmission. + Such files are also named "*multi-page* TIFF" or "*multi-image* TIFF". + Refer also to :doc:`/multi_page`. + +.. _SubFile: + +Subfile: + *Subfile* is a term in the TIFF 6.0 specification for + an image and its associated *Image File Directory (IFD)* + in a TIFF file containing one or more images. + In order to better understand how TIFF works (and consequently this software) it is important to recognize the distinction between the physical organization of image data as it is stored in a TIFF and how |