Exposure Compensation and Spot Metering: Fixing Underexposed and Overexposed Pictures
Tony Northrup explains how to use the ‘exposure compensation’ feature, along with your digital camera’s histogram reading to correct under or overexposed images.
N.B. if using the exposure compensation button on your camera, be aware that it only works in automatic mode (e.g. aperture, shutter or programme/program priority). Alternatively you can set the camera to manual, take a shot and compensate for the under/overexposure yourself in a similar fashion.
See also video on exposure compensation with photographer Mark Wallace.
Source: Tony Northrup