1. A target for calibrating digital cameras prior to exposing images of original scenes to image sensors in the camera, the target comprising: at least a white target area reflecting substantially all wave lengths of visible light incident thereon, and at least a black target area absorbing substantially all wave lengths of visible light incident thereon; the white and black target areas having substantially equal areas, wherein simultaneous exposure of the image sensors to the target at locations of original scenes determines desired exposure settings for images at the scenes.