Digital Photography Basics: Reading Histograms
Understanding how to read a histogram is the best way to judge exposure in high-contrast scenes like this.
With film, exposure always involves some guesswork—you can never be sure you made the correct exposure until you develop the film. But with digital cameras you can tell immediately whether the right amount of light reached the sensor by looking at a histogram. This ability to instantly evaluate exposure is a game changer—the single biggest advantage of digital photography over film.
But many photographers are still guessing about exposure because they’re unable to decipher the histogram’s cryptic messages. Instead they judge exposure by how bright the image looks on their camera’s LCD screen. But while those little screens are extremely useful for many things, evaluating exposure isn’t one of them. There are too many variables: screen quality (usually bad), the LCD brightness setting in the camera, and the amount of ambient light.
