Adobe 29180155 User Guide - Page 310

ADOBE PHOTOSHOP ELEMENTS 4.0 305 User Guide 48-bit RGB color A high-bit image mode that can contain thousands of colors per channel. Photoshop Elements supports 8-bit or 16-bits per color channel, so an RGB image can be a total of 24-bit or 48-bit, depending on the bit depth per channel. fuzziness A tolerance setting for the Magic Wand tool and the Replace Color command. It controls the degree to which related colors are included in the selection. See tolerance. G gamma adjustment The contrast resulting from darkening or lightening the midtones of an image. When you adjust the gamma, you change the brightness of the midtones without substantially affecting the highlights and shadows. gamut The range of all possible color combinations and tones in any color system, that is, the colors that a device can reproduce in any given color space. Gaussian blur A softening effect applied through a bell-shaped distribution of tones and colors. GIF Graphic image file format. A file format suitable for images that contain line art, large areas of a single color, and text. Web animations are done with images in GIF format. gradient Any of several methods for achieving a smooth transition between two adjacent colors, including black and white. grayscale A single-channel image that includes only black, white, and shades of gray. Depending on the bit depth, grayscale images can reproduce various shades of gray. Gray working space profile A predefined profile that determines how best to display and print grayscale images for a given color setting. H halftone A monochrome image made up of variably sized dots simulating the shades of gray in a photograph. It is used for reproducing photographs on a printing press. highlight and shadow The lightest and darkest colors in an image. highlights The brightest elements in an image. Compare to shadows. histogram A bar chart showing the distribution of the pixel values in a digital image. The horizontal axis represents levels from 0 (darkest) to lightest (255), and the vertical axis represents the numbers of pixels at each level. history state An image state listed in the Undo History palette. hotspot An area in which light is concentrated to such a degree that all detail is lost; that is, an area that is blown out to white. HSB A color mode that is based on the human perception of color and describes it according to hue, saturation, and brightness. hue The color reflected from or transmitted through an object. In common use, hue is the property that allows a color to be distinguished as red, blue, yellow, and so on; the "color of a color." hue jitter Sets the rate at which the stroke color switches between the foreground and background colors. Higher values cause more frequent switches between the two colors than lower values.