Color Channel
Any one of the red, green or blue elements of a color image. Since color images are assigned 8 bits per pixel for each of the red, green and blue channels, each pixel is assigned 24 bits of data. The master channel is the composite of these three channels. In the Histogram and Tone Curve image adjustment functions, each channel can be separately or collectively adjusted.
Color (Documents)
An image mode that reproduces images with the same number of color tones as the Color (Photos) image mode, but scans more slowly to obtain better definition of fine lines and text. See Color (Photos).
Color (Photos)
An image mode that scans an image as red, green and blue (RGB) light and can reproduce each one of these three colors in 256 distinct tones (8 bits). Since 256 x 256 x 256 = approximately 16.7 million, this many color tones are possible in this mode.
ColorSync
A color management system for Macintosh computers. Automatically compensates for color differences between scanners, monitors and printers. ColorSync requires that a color profile file be included for your specific monitor or printer.
Contrast
The difference between light and dark areas of a scanned image. Raising the contrast makes individual components of an image stand out more while lowering it softens the image’s overall appearance.
Dot
The basic element used to reproduce images. Images are reproduced as columns and rows of dots. A scanner’s resolution is the measure of the number of dots it can read and reproduce per inch (dpi).
DPI
Dots per inch. An expression of monitor and printer resolution. Measured as the number of dots per horizontal inch on monitors and the number of dots that can be printed by a printer in an inch. See also Pixel, Optical Resolution and Resolution.
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