In-camera, histograms can help you get the best exposure possible and see quickly if information is lost from over or under exposure. In post, they can help you fine-tune the image.
Here’s a simple example of what correct, over, and under exposure could look like on a histogram.
Here it’s balanced.
Here the image is underexposed and the histogram is pushed to the left.
Here – over exposed and it’s to the right.
That said, there are times when your histogram may not look balanced – e.g. nightscapes or snowfield + tree. Regardless, knowing the rules will help you recognize when they don’t apply.
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