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Processing to CMYK. Pictures inverted???

NN143105UL1
Hello everybody!
I´ve been using CO together with my Canon 1Ds for over 2 years now.
Finely it is possible to shoot tethered with 3.7, with allmost no hangups!
I just upgraded to 1Ds MarkII, and life is wonderful! hehe
I expierience many of the same problems that you other guys are.
One big thing is the slow processing of the files, regardless of what outputsize of format I choose. The processing kind of \"hangs\" for a long time in the end... How come?
--My main question now is this:
When I develop files into \"Euroscale coated v2\" the files end up inverted. They look correctly if I just invert them in Photoshop.
This only happen when I choose JPEG-format. TIFF-format is looking good.
Is JPEG and CMYK not good companions?

Sveinung
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10 Kommentare

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  • Chris1
    Sveinung,

    Two questions:
    What are your JPEG settings in the \"Process\" panel?
    What do you mean by \"inverted\"? Are all the colors opposite, like whites are black and reds are cyan?
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  • NN143105UL1
    Hi Chris!

    My settings are:
    JPEG high
    Euroscale Coated v2 (the profile I want to use!)
    Quality: High
    300 px/in

    And yes, the colors turn out \"opposite\" / inverted as you describe.

    ---
    Sveinung
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  • Chris1
    Sveinung,

    The only other thing I can think of is that your ICC workflow is corrupted somehow. Check to make sure you are using the correct source camera profile. Also check to see which \"conversion\" method is used. Do this by opening C1 preferences and click the ColorSync link. For RGB to CMYK conversions, use either perceptual or relative colorimetric, and use \"Best\" for quality.

    Is your system set up like this?
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  • NN143105UL1
    Yes, my system is set as you describe. I even tried both versions of conversion; Perceptual and Relativ Col.
    No differense. All processed files ends up like this: white is black, red is cyan and so on........

    Not a HUGE problem for me. I can convert the profile in Ph.Shop, but it should have worked, shouldn´t it?


    ___

    Sveinung
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  • Anonymous
    Sveinung & cbphoto,

    Tried to duplicate your criteria and results without success.
    With a little research there does seem to be an issue with CMYK JPEGs and it appears to be related to PhotoShop version. I am using CS, what version are you guys using?

    Sincerely,

    k c
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  • NN143105UL1
    Hi KC!

    I am using CS2

    Sveinung
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  • Anonymous
    Sveinung,

    Well, it looks like this is a known issue and a Hot Topic on several Forums.
    There is a lot to read-up on to know more.
    I found quite a bit of info by Google > \"CMYK JPEG\"

    It appears that Adobe Photoshop writes inverted data in CMYK JPEG files


    cmyk jpegs generated from other applications will > become inverted.


    http://support.wolfram.com/applicationp ... pcmyk.html

    http://www.ledet.com/margulis/ACT_posti ... PEGbug.htm

    http://mail-archives.apache.org/mod_mbo ... o.ns.ca%3E

    Hope this helps in establishing your workflow for CMYK images.

    Cheers,
    k c
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  • NN143105UL1
    Thanks a lot!
    I will look closer into the links.

    Maybe the only way is to process all cmyk-files into TIFF...





    Best
    Sveinung
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  • Chris1
    Sveinung,

    I am very surprised at this result! No one would have thought that the JPEG parameters in Photoshop were inverted.

    I've nevered processed files into CMYK JPEG format from Capture One before so I was very surprised at the results.

    As a policy, at our small studio, we always process TIFF files from C1 and then use \"File Info\" to insert the job info and copyright info into the file. Then, when needed, convert to a CMYK JPEG in Photoshop.

    (That's why I've never seen this problem before).

    I will say that someone requesting a CMYK JPEG is asking for problems, though. The compression algorithms in the JPEG format are designed to lose data and this always causes problems in areas of fine and intricate detail.

    For the last several years, I've been \"zip\" compressing TIFF files and uploading them to my web site for clients to download. This has worked very well with all levels of people in the production chain.
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  • NN143105UL1
    Chris,

    Thanks for all your effort and time trying to solve my problem!
    And yes, of course one should not use jpeg this early in the process. Only as the last saving, if you really have to...

    Anyhow, maybe the Photoshop-guys should look into this?


    Sveinung
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