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How to read the Histogram. A histogram is a graphical representation of the pixels exposed in your image. The left side of the graph represents the blacks or shadows, the right side represents the highlights or bright areas and the middle section is mid-tones (middle or 18% grey).
The histogram is the graph that you can view on the back of your digital SLR. Itâs the graph that looks sort of like a mountain range. Pardon me while I break into some techno-mumbo-jumbo for a moment here: a histogram shows you the brightness values of all of the pixels in your image.etâs say you take a picture of someone who is wearing a red shirt. Imagine the red shirt is brightly lit. You look at the overall brightness histogram and it doesnât appear to be overexposed. Then you look at the Red histogram and see a big pile of pixels piled all the way to the right side of the graph.