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Exposure Warnings

David Redfearn
I have the Exposure Warning preferences set to 255 and the Shadow Warning set to 0. I get over-exposure warnings for some images (in particular, after using the Auto Levels function). I have noticed that (1) the image looks perfectly fine after turning off the warning; (2) when I "hover" the cursor over the area being flagged as over-exposed, the values (RGB and Red, Green, Blue) pixel values don't come close to 255 (why are they being flagged?); and (3) viewing the same image in DxO and RawPower (with default RAW processing) don't show the same exposure warnings.

If I have set the exposure warning to 255 shouldn't at least one of the pixel values be 255? I'm starting to loose faith in these warnings.

Can anyone help me understand what is going on here?

David

Capture One Pro 12.1 on macOS 10.14.5.
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Comments

5 comments

Date Votes
  • Ian Wilson
    Moderator
    Top Commenter
    There was a good explanation of the exposure warnings and the various options you can set for them in a recent Capture One webinar. See this video and click on the link to the exposure warnings section in the description below.

    Ian
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  • charles kasler

    I just saw this old post. I was wondering what is the best setting for shadow warning? I use the default for highlight. Ian no link shows in yr reply - maybe it was removed?

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  • SFA

    If the post was that long ago it would be one that has come from the previous forum and we were advised that the links did not convert from the old to the new - presumably because most of the material was moved anyway.

    It would be worth trying a search in the community. Many of the Webinars have had indexes for content included since about a year ago and it is possible that the webinar or some other useful information will appear on the search.

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  • BeO
    • Edited
    Top Commenter

    In my opinion there is no best setting, any value between 0 and "around dark" will do.

    The question is rather what is the best usage of the shadow (or highlight) warning, and this totally depends on your specific image, your idea how to develop your image, and your targeted output.

    How much of your image you allow to be pitch black or near black or deep dark, or how much do you maybe even require to be pitch black, e.g. assume a low key image or abstract image with lots of black or deep dark shapes contrasting some bright shapes or lines as you somtimes see in great BW photographs. And how much difference you want to see an neighbouring dark areas, or not.

    As long as you know what your setting is, so that you can relate the amount of blue pixels or areas, or the absence thereof, to some information which is meaningful for you, any value should serve you well. 

    Regards

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  • charles kasler

    Good ideas, thank you both!

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