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Shifting Colour Balances

Permanently deleted user
Why is there such a large shift in colour balance when jumping from 5550K to 5600K?

Also why is there such shift in exposure when jumping from -0.1 and -0.2 when using the phaseone backs?
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Comments

3 comments

Date Votes
  • Robert5
    Alistair - I've been experiencing the same "jump" with the K slider. I'd asked around, but no one seemed to know what I was talking about. And exposure jump, too. I check that I had the latest firmware, etc etc.

    This happens on BOTH my P25 & P30/h101 backs. Also, in order to "compensate" (it still looks awful) I have to take the green/magenta slider WAY over. Then, if I select another file and then return back, the g/m slider has gone wacko; the thumbnail shows correctly, but the g/m number will have gone from, say, +67 to -103. If you click on the slider it then shows the -103 (eg - SUPER green).

    C1 people - what IS this? Hopefully someone can help, because it's rather problematic and yet I haven't found anyone (until Alistair) with the same issue.

    ~Rob

    P25 & P30/H101
    RZ67 & H2 (respectively)
    Macbook Pro
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  • Anonymous
    This is a Bug.
    We do get misrepresentations in the Kelvin values in Capture One.
    This has been improved greatly in most current version of Firmware and Software, and Developers continue to work on this issue.
    >P25 = firmware 3.3.4
    >P30 = 2.3.6
    >Capture One = 3.7.6

    The images look fine but the value slider varies a lot.
    We are looking into this issue but no proper solution found to date and it will not likely occur until version 4.0 is available.
    Workaround =
    Set the White Balance as normal and pay no attention to the Kelvin slider numbers, and continue to work.

    Please review Knowledge Base articles:
    #2233 Good White Balance:
    http://www.phaseone.com/Content/Support ... nguageid=1

    And # 1706 Creating Custom WB in Capture One for Pbacks:
    http://www.phaseone.com/Content/Support ... nguageid=1

    Sincerely,
    K C
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  • Robert5
    Hey Keith - thanks for the reply. I'll keep an eye for further updates to the firmware.

    I still did have a question, though: You said that in the bug the images "look fine" - but in my case - and it sounds like Alistair's as well - there's this big "jump" between 5550K and 6000K. Also, between -.1 and -.2 on the exposure slider. What is the reason for that? Thanks!

    ~Rob
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