Sportidi wrote in post #12811822
My scenario had half the image blinking and the other half wasn't. Wouldn't reducing exposure compensation affect the areas which weren't been highlighted?
Yes, it will affect the whole image.
The "blinkies" are simply a tool to show you the parts of an image that are blowing out, and recording no detail. What you do with that information is up to you, but the information can be invaluable.
It sounds like, in your scenario, the sky was blown out. In this instance, you can either take steps that will affect the sky alone (such as employing a GND filter) or make an exposure choice depending on the importance of various parts of the scene. Naturally, in this case, you don't want to drastically underexpose the ground areas as that is your subject, but a small amount of compensation may bring detail into some of the sky whilst leaving the subject area enough exposure to record all the detail and bring it up in post. If you use the blinkies in conjunction with the histogram, you can tell a great deal about how your image is recording. If you have blinkies, but there is space to the left of the histogram curve, then you know you can reduce the exposure without losing shadow detail.
In another scenario, you may be photographing something light and it is the highlights that are important. A good example might be shooting a bird against dark foliage. Something like a barn owl, with it's white chest, can easily blow out in sunlight. If you watch the blinkies, the metered exposure will likely show blinkies on the chest, meaning that you have lost all feather detail. You may need -2 stops of EC to stop the blinkies and record all the detail, and you can leave the background to be underexposed as it is less important.
The histogram is useful for telling you that some parts of a scene are blowing out, but the blinkies tell you which parts - whether they are an unimportant part of the scene (perhaps spots of reflective highlights on water or chrome, which will look OK as pure white) or a vital part of the subject.
I leave my blinkies enabled to give me the most information I can get.