Different levels of photography require different levels of understanding and skill. A “press the button, let George do the rest” photographer needs little or no technical knowledge of photography. A zone system photographer takes more responsibility. He visualizes before he presses the button, and afterwards calibrates for predictable print values.
A histogram is a chart representing distribution of values. In digital cameras and most image-processing software, the most common histograms represent the distribution of brightness or luminance values in an image.
Histograms offer important information at a glance, which can be used to judge the effects of adjustments as we apply them, as well as to avoid ...