Exposure warning
The Exposure warning in Capture One colours the parts of your photo that are too light or too dark, so you can see at a glance where detail is being lost. Blown highlights and crushed shadows are clearly marked. It's a checking aid that doesn't change your image itself.
Turn the warning on and areas without detail get a bold colour, often red for too light and blue for too dark. That tells you exactly how much room you have before your exposure or curve goes too far. It pairs nicely with the histogram, which tells the same story as a graph. Tip: set the warning's thresholds to your own taste, so you only get a flag at genuine loss of detail.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.