A correction factor, called gamma correction, is frequently used to compensate for such differences. For instance, when colors are produced by computer monitors, they can appear different than they would if they were produced on a printing press. In addition, the physical tone characteristics of a device are often different on different devices. Most every printer type uses different colorants and prints at particular resolutions. The number of bits per pixel depends on the type of display and display adapter being used, and the mode to which that the adapter is set.
Each pixel has a set number of bits to store its color or color index value. For instance, the building blocks of screen images are pixels. This is called color mapping or color matching.īoth color conversion and color mapping must take into account a number of device-specific factors. Once the values are specified in terms of the CYMK space, they need to be matched to the closest color that the printer can produce. Since the printer probably uses a device-dependent CMYK color space, all RGB values must be converted to CYMK. If you want to print it on a printer, it must be converted to the printer's color space. This process is called color mapping.įor example, if you have a digital image that you created on your display, it may be in a device-dependent RGB color space. Since the white point of a color space varies from device to device, a converted color must then be matched to its visually closest color in the destination color space. All colors in a color space are fixed relative to the color space's white point. The process of converting colors from one color space to another is called color conversion.
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