PDImageSelectAlternate"is obsolete and never called in Acrobat 8". Howswitch to alternate images?

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  1. #1

    Default PDImageSelectAlternate"is obsolete and never called in Acrobat 8". Howswitch to alternate images?

    PDImageSelectAlternate "is obsolete and never called in Acrobat 8". Then how can I switch to alternate images to display in Acrobat 8 and 9?
    vadim repin Guest

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  3. #2

    Default Re: PDImageSelectAlternate"is obsolete and never called in Acrobat 8". Howswitch to alternate images?

    Why would you want to? The optional content feature of PDF, introduced in PDF 1.5, is a MUCH more flexible and reliable method of doing alternative images.
    Leonard_Rosenthol@adobeforums.com Guest

  4. #3

    Default Re: PDImageSelectAlternate"is obsolete and never called in Acrobat 8". Howswitch to alternate images?

    The goal is to speed up screen redraw (using low resolution proxies). High-end prepress software usually provide option to generate alternate images while "normalizing" incoming PDFs. And (at least) Enfocus Pitstop can switch on/off their display in Acrobat 8 and later. The question is how they do it, if PDImageSelectAlternate "is never called". Well, I chose this subject as practice for my first plugin, because it seemed to me straightforward and simple. It looks like I was wrong.
    vadim repin Guest

  5. #4

    Default Re: PDImageSelectAlternate"is obsolete and never called in Acrobat 8". Howswitch to alternate images?

    I can't comment how Enfocus writes their software, but yo uare welcome to ask them...

    As far as "high end prepress software writing such images" - I have NEVER seen any such product write these data structures. At one time, such products used an EVEN OLDER technology called OPI to provide alternates, but that is NOT the same PDF feature as Image Alternates.
    Leonard_Rosenthol@adobeforums.com Guest

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