Q: CMYK-JPEG positive/negative problem

Discussion in 'Photoshop Tutorials' started by Christian Westphalen, May 25, 2005.

  1. Hi,

    Photoshop supports the out-of standard CMYK-JPEG format and depending on
    the version of PS it´s often rendered in third-party-applications as a
    negative. I recommend to use EPS JPG-coded, but what i really would like
    to know:
    How can i decide, if i have to render the JPEG positive or negative? Is
    it a decision based on the creator or is there another tag that i could
    use for the decision?

    Thanks in advance,

    Christian Westphalen
    Christian Westphalen, May 25, 2005
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  2. Christian Westphalen

    Tacit Guest

    Why? If you're using EPS files, odds are good your intentions are to
    take them to press. Why bother with lossy compression that degrades
    image quality? Anyone who's doing professional print production in this
    day and age should be able to handle uncompressed files; hard drives and
    RAM are cheap, cheap, cheap.
    Tacit, May 25, 2005
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  3. It´s a question of bandwith, there are still some places where DSL is
    not available and it´s "good enough" f.e. for newspaper print.

    Christian Westphalen, May 25, 2005
  4. Christian Westphalen

    Odysseus Guest

    Moreover JPEG-encoded EPSFs may not separate properly from certain
    applications (e.g. QuarkXPress) or on certain RIPs. Uncompressed files
    are much more portable IME.
    Odysseus, May 25, 2005
  5. Christian Westphalen

    Tacit Guest

    In that case, the files can be sent compressed but should probably be
    uncompressed before placement and output; as someone else has already
    mentioned, JPEG-compressed EPS files do not separate reliably.
    Tacit, May 25, 2005
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