Gamma correction
Gamma correction is a function that adjusts the light intensity so it matches the output device.
Although an image may display clearly on your CRT display, your printer may not produce it the same way. Since image reproduction depends on the output device (CRT, printer, etc.), gamma correction adjusts the light intensity so the image is faithfully reproduced on the output device you are using. The term gamma refers to the ratio between the input and output light intensity.
Display A | Display B |
Printer A | Printer B | Printer C |