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Using illustrator to open/save PDFs not recommended even by Adobe itself
Authored by: Thomas Kaiser on Mar 21, '03 02:55:30AM
Just for the records. Illustrator is not a PDF editor. Read what Dov Isaacs
from Adobe wrote on the pdfzone.com mailing list:

    FYI, Adobe Illustrator is NOT, repeat NOT, a general-purpose
    PDF file editor. When you "edit" a page of a PDF file with
    Illustrator, Illustrator in fact converts the contents to its own
    internal format (which contrary to urban legend is NOT PDF!).
    This conversion can be very lossy. The only PDF files that
    Illustrator can fully successfully "open" are single-page PDF
    files "saved" from Illustrator itself with the retain editability
    option selected. Otherwise, Illustrator can and does lose
    certain PDF objects, convert text encodings, convert
    colorspaces, etc.
    When you save such an edited page, Illustrator effectively
    deletes the old page, and adds a new page in its place.
    This has several ramifications: (1) The space used by the
    old page may not be reclaimed and (2) the generated PDF
    does not share any objects or definitions with content from
    other pages within the same PDF file, even if it did so prior
    to the edit.

Regards,

Thomas

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