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White Balance (Kelvin) Changed without User Action

Permanently deleted user

I am new to Capture One, working on my first RAW editing, I don't know if it is a bug or my C1 setting is "wrong", I usually set my white balance Kelvin to either the 50 or 100 round figures (ie 5200K, 5250K, etc.), after editing a few photos, when I went back to some of them, the Kelvin value is changed without my knowledge, it is like 5401, 5226, 5577, etc. I can't remember what exactly they should be, but they should be round to the 50 or 100K, ie 5200, 5450, 5250.

Is there any auto setting I am not aware of and shifting my Kelvin values?
Or other tools have a side effect on the White Balance setting which I don't know about yet?

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Comments

6 comments

Date Votes
  • gb

    As far as I know the only things that affect WB are the WB Mode selection, the WB color picker itself and the Normalize color picker (if checkbox ticked).

    It might be worth dragging the WB tool out of the tools tab and onto your image as you work on it.

    Keep a close eye on it and see if you can spot when it changes as you use the other tools.

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  • Permanently deleted user

    HI gb

    Thanks for the suggestion.

    I never heard of Normalize color picker, good to know another option to adjust WB.

    I followed advise from C1 support to create a new session and did some WB, exposure, and high dynamic range adjustment, could not reproduce the white balance changes yesterday.

    Today, open the session again, found out two out of the six images have the WB changed!

    I only have six images in this session, they are set at 3500K, 3600K, 3700K, 3800K....4000K.

    Today, the WB values are 3499K, 3601K, 3700K, 3800K...4000K.

    So image #2 stole 1K from image #1. 😲

    Is it due to opening/closing the session? Or the browser and viewer windows resizing, I have two monitor setup and not sure if the non-identical pixel dimension (1920x1200 and 1920x1080) has any effect on the windows resizing and thus the WB values.

    1K change in WB is ok, but I cannot confirm how often this change happens, and if it is only 1K every time for all my images.

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  • gb

    That's pretty weird.
    Non identical monitors or window sizes definitely should not affect WB.
    Such a small change in WB value sounds like some kind of mathematical rounding error as the your session closes and then reopens, maybe.
    Hopefully customer support can work it out.

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  • Permanently deleted user

    Finally got the time and manage to reproduce the white balance change.

    Closing and re-opening the session changes the white balance setting of some images.

    Below is my result.

    Total 45 images filtered in session.

    14 of them have a different white balance value after closing and re-opening the session.

    The changes are small though, between +/-1K to +/-3K.

    What I can't confirm is that if the session is opened/closed many times, will the white balance value keep drifting further and further or as gb mentioned above, it's a mathematical rounding error, then it should get "stabilized".

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  • gb

    Have you contacted C1 customer support yet?
    Given C1's projected reputation for color accuracy I think they would be keen to know what's going on here.

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  • Permanently deleted user

    Thanks gb for the suggestion.

    C1 customer support was informed, they are very good and provided suggestions which help me to reproduce the issue.

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