| Channel (digital Image) |
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In the digital realm, there can be any number of conventional primary colors making up an image; a channel in this case is extended to be the grayscale image based on any such conventional primary color. By extension, a channel is any grayscale image the same size with the "proper" image, and associated with it. It is important to understand that the channels are a conventional term used to refer to a certain component of an image. In reality, any image format can use any algorithm internally to store images. For instance, GIF images actually refer to the color in each pixel by an index number, which refers to a table where three color components are stored. See Indexed Color . However, regardless of how a specific format stores the images, discrete color channels can always be determined, as long as a final color image can be rendered. CHANNEL TYPES Three main channel types (or Color Spaces ) exist, and have respective strengths and weaknesses. They can all be freely converted between each other, although the CYMK color space is a Superset of the other two. RGB An , and are used in Computer Display s and Image Scanner s. If the RGB image is 24-bit (the industy standard as of 2005), each channel has 8 bits, for red, green, and blue -- in other words, the image is composed of three grayscale images, where each grayscale image can store discrete pixels with conventional brightness intensities between 0 and 255. If the RGB image is 48-bit (very high resolution), each channel is made of 16-bit grayscale images. RGB Color Sample |
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