Exposure Warning Thresholds

I must admit this is something I've never been completely clear on. Obviously you typically don't want a channel to hit 0 or 255 in a part of an image as you're then losing detail, but what's the thought process behind setting the thresholds to other values (e.g. The default highlight threshold of 250) and how are these values chosen? My only thoughts are that with certain print methods/mediums too dark or light and you will just be seeing the paper or get a noticeable build up of black, but outside of that (e.g. processing for web use), all I can think is with certain tone curves you want a premature warning that things are imminently going to blow out with more adjustments. Would this be correct? Or am I missing something?

Benjamin Liddle

27. April 2017 20:08

all I can think is with certain tone curves you want a premature warning that things are imminently going to blow out with more adjustments.

Yes, you're correct here. It's also good to note that the Exposure Warning will alert to areas where single channels are above the threshold- so, for example, if you were shooting neon activewear, the green channel may be clipped out and that would give a loud indication that your colors are out of gamut.

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