The histogram is the most accurate exposure tool on your camera -- more reliable than your LCD screen. Here is how to read and use it.
A histogram is a graph showing the distribution of tonal values in an image from pure black on the left to pure white on the right. Every pixel in your photo is counted and plotted at its brightness level, giving you an objective map of your exposure.
Your camera's LCD brightness varies depending on ambient light and screen brightness settings. A photo that looks perfect on a bright screen outdoors may be significantly underexposed. The histogram is objective data — it does not change based on viewing conditions.
A well-exposed image generally has data spread across the full tonal range without touching either edge. Here is what different shapes mean:
In RAW photography, pushing the exposure as far right as possible without clipping highlights preserves the most shadow detail and reduces noise. This is counter-intuitive — the image may look slightly bright on the LCD — but it is technically correct. You bring the exposure down in post while retaining clean, detailed shadows.
Most cameras allow you to display a histogram on the LCD in playback mode and, on mirrorless cameras, as a live overlay in the viewfinder or on the rear screen. Check your camera's display settings menu. Once enabled, get in the habit of checking it after the first few frames in a new lighting situation rather than guessing by eye.
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