IFX Mail Archive: IFX> PDFax Image format 'tree'.

IFX Mail Archive: IFX> PDFax Image format 'tree'.

IFX> PDFax Image format 'tree'.

From: Rick Seeler (rseeler@adobe.com)
Date: Wed Sep 18 2002 - 18:00:42 EDT

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    IPPFax people,

    I see the image format support for PDFax taking the following 'tree'
    structure.

                                   S
                                  / \
                            B&W / \ Color & Gray
                                / \
                          F ---/ F --- M
                              / \
                             J C

    Where:

    S is CCITTFaxDecode (Required by all implementations).
    F is FlateDecode (Lossless compression).
    J is JBIG2Decode (Lossy and lossless compression).
    M is Masked Image. This format may also (optionally) be used with
    format C.
    C is DCTDecode (JPEG).

    All formats in the tree above the format in question must also be
    supported, i.e. to support format 'M', formats 'F' and 'S' must also be
    supported. 'LZWDecode' has been left out of this diagram as it has been
    encumbered with some IP that makes is undesirable. 'FlateDecode' was
    added to PDF for this purpose.

    Comments?

    -Rick



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