Autodesk 00126-050008-1630A User Guide - Page 86

WiseImage - User's Guide General notes Monochrome images, also referred to as "black-and-white" or "bitonal", use one bit to represent each pixel color (black or white). Grayscale images, also referred to as "gray-level", consist of different gray tone pixels. Grey levels vary from 0 (black) to 255 (white). Thus, in grayscale images, one byte is sufficient to store information on each pixel color. Depending on the number of bits of color information, a color image can consist of pixels requiring 4, 8, 16, 24 or 32 bits per pixel to represent a color. A large part of the visible spectrum of colors can be made by the mixture of three basic color components in different proportions. These components are known as the primary colors: red, green and blue (RGB model). Each component has 256 levels (from 0 to 255). An RGB color image is an image that requires three bytes (24 bits per pixel) to store color information of each pixel; one byte (256 levels of brightness) is required for each of the original colors. The HSV model is based on color perception by human eye. In the HSV model all colors are described in terms of three basis characteristics: · Hue is the wavelength of light reflected from or transmitted through an object. More commonly, hue is identified by the name of the color, such as red, orange, or green. Hue is measured as a location on the standard color wheel and expressed as a specific angle between 0° and 360°. · Saturation is the equivalent of the intensity or purity of a color. Saturation represents the amount of gray in relation to the hue and is measured as a percentage from 0 percent (gray) to 100 percent (fully saturated). · Value (or brightness) is the relative lightness or darkness of the color and is usually measured as a percentage from 0 percent (black) to 100 percent (white). 88