short for Cyan, Magenta, Yellow, and Key (black). This is a subtractive (reflective) color model used in printing. The three color inks plus black are combined together on a base of white (paper) to form color images. The more ink is added, the darker the image becomes.
The process of reducing an image file by removing un-needed pixel information. When an image is captured the scanner takes a picture of the item in the scanner. This picture will contain 1 pixel for each color found. Compression reduces the image so that pixels of little to no change in color are combined into 1 color or greyscale value.
in an image is determined by the difference between light and dark tones in a scene. If there is not enough contrast a picture may appear too gray or dull. Bitonal images are considered high contrast, because they are only black and white. High contrast images of text files are easier to read and result in much more accurate OCR results.