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lauraj26961942
lauraj26961942
Participant
January 9, 2019
해결됨

How to convert many pictures from RGB in CMYK at the same time?

  • January 9, 2019
  • 4 답변들
  • 11531 조회

Hi, how can I convert many Pictures from RGB in CMYK a the same time? In Photoshop 2019 it doesn't work the same way like in Photoshop 2018.

    이 주제는 답변이 닫혔습니다.
    최고의 답변: Mike_Gondek10189183

    Save an action that converts to CMYK, then assigns your profile and set that here. Mine is GRACOL.

    Warning about the .tif format. The image processor does something to the file where when you place in Illustrator the transparency works, but in InDesign transparency is corrupted. Use the .psd format, .tif is so old an not updated that issues like this exist.

    4 답변

    rob day
    Community Expert
    rob dayCommunity Expert
    Community Expert
    January 9, 2019

    Are the pictures getting placed in a page layout? Why not make the conversion either at the export to PDF or at output in the RIP?

      D Fosse
      Community Expert
      D FosseCommunity Expert
      Community Expert
      January 9, 2019

      Actions and Batch work exactly like they always have. Make an action to convert, and run that action in a batch.

      And now for the mandatory warning. Feel free to ignore if you already know this:

      You don't really want to do that, because it ties you to a specific print process. You lose future flexibility. Unlike RGB working spaces, CMYK isn't generic. Every CMYK profile represents a particular combination of offset press, ink, and paper stock.

      CMYK to CMYK conversions is something you normally want to avoid for a whole lot of reasons. Hence the lock-in.

      With RGB master files you're free to convert as needed, when you know the actual process and can pick the appropriate CMYK profile.

      Use Convert to Profile, don't ever use Image > Mode > CMYK. That just converts to whatever CMYK profile you have as working CMYK. The default in Photoshop is US Web Coated (SWOP), which is not used anywhere outside the Americas - and may not be right within it either. This is something you always need to ask the printer about.

      c.pfaffenbichler
      Community Expert
      c.pfaffenbichlerCommunity Expert
      Community Expert
      January 9, 2019

      Also: Why do you need to separate the images and did you get the CMYK space definition from the actual print provider?

      Many people prefer to separate on pdf export from the layout application – in principle separating in Photoshop would provide an option to catch certain issues (banding, suboptimal Render Intent, …) but if one batch processes the images in one go that advantage does not seem to come into play.  

        rob day
        Community Expert
        rob dayCommunity Expert
        Community Expert
        January 11, 2019

        Many people prefer to separate on pdf export from the layout application – in principle separating in Photoshop would provide an option to catch certain issues (banding, suboptimal Render Intent, …) but if one batch processes the images in one go that advantage does not seem to come into play.

        Sorry, I posted the same without reading yours.

        InDesign lets you customize the rendering intent for any image file via Object>Image Color Settings, so there would have to be another unusual reason like a post-CMYK color correction—i.e. some text that needed to be a specified CMYK build like 50% K, or getting to a CMYK color outside of the source RGB space like 100% cyan.

        c.pfaffenbichler
        Community Expert
        c.pfaffenbichlerCommunity Expert
        Community Expert
        January 12, 2019

        InDesign lets you customize the rendering intent for any image file via Object>Image Color Settings, so there would have to be another unusual reason like a post-CMYK color correction

        Certainly, but I suspect some people may be more likely to catch issues when checking the images one by one in Photoshop than the whole of them in a pdf.

        And as for banding I am afraid that might be overlooked altogether if one does not also check the Channels in Acrobat (or whichever application one uses for pdf viewing and editing).

        c.pfaffenbichler
        Community Expert
        c.pfaffenbichlerCommunity Expert
        Community Expert
        January 9, 2019
        In Photoshop 2019 it doesn't work the same way like in Photoshop 2018.

        And what way was that?

        Actions in combination with Batch, Image Processor, … should still provide options to process multiple files.

        lauraj26961942
        lauraj26961942작성자
        Participant
        January 9, 2019

        Thank you for your quick answer!! You're right, but I can't change the Color profile with the Image Prozessor. I don't find the button.

        Stephen Marsh
        Community Expert
        Stephen MarshCommunity Expert
        Community Expert
        January 11, 2019

        Great question.  Gracol is not defined as our working space on our computers. Other reason is some images are already CMYK, and for this client we need Gracol. We get images from a variety of sources so being extra safe.


        Great question.  Gracol is not defined as our working space on our computers. Other reason is some images are already CMYK, and for this client we need Gracol. We get images from a variety of sources so being extra safe.

        Thanks Mike. There are some very specific workflows with valid desired outcomes where one may convert to profile A, then assign profile B… However these are not the norm… And there are some very specific and valid workflows where using the Image > Mode > CMYK command is desired over using Convert to Profile. Again these are exceptions to the rule.

        The following is intended more for those new to CMYK who may be confused...

        I am going out on a limb by saying that for most users I would advise against converting to profile A then tagging profile B as the valid description of the image! If you want profile B, use convert to profile and select profile B, which will convert the values into the desired visual appearance and also tag the desired profile at the same time.

        Although it is possible to “permanently” hide the warning and reset it back on again – here is the standard “warning” when using the Image > Mode > CMYK command (this window is suppressed when recorded into an action):

        In the case of the message above, if Fogra39 is not the desired output condition, then using Image > Mode > CMYK is probably not the best thing to do, nor is assigning a different profile (however there are valid exceptions to the rule).

        Generally to maintain the original correctly profiled visual appearance, one would convert to profile using the correct destination profile and that is it, a single step with no assign profile changing the visual appearance (but not the values/numbers).

        If you have images in CMYK that have a correct profile tagged against them, again the convert profile route will preserve the visual appearance by changing the numbers/values. If changing the numbers/values is not desired, then simply assigning another profile will indicate the expected visual appearance. If you have images that do not have a CMYK profile (mystery meat) – then they will be displayed using your Working CMYK space and assigning a new profile will again indicate the expected visual appearance in the assigned space. If one is not converting and simply assigning a different profile, then one may need to manually edit the image (changing values/numbers) to account for the difference in appearance that the newly assigned profile is indicating.

        So unless one really understands what is going on, my advice would be to convert to profile and not assign a different profile to an image that has been converted to CMYK via the Image > Mode > CMYK command.

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