JPEG The abbreviation for Joint Photographic Experts Group. JPEG is a lossy compression technique for color images. Although it can reduce files sizes to about 5% of their normal size, some detail is lost in the compression. JUSTIFICATION The method used to align paragraphs of text within a text object’s margins, either left, right, center, or full. KERNING Adjusting the normal space between characters in text; also, the amount of the adjustment. LAB COLOR An image mode in which the color components are divided into a lightness channel and A and B color channels. LANDSCAPE Orientation of an illustration or page that is wider than it is tall. LAYER A level in a Canvas document used to organize parts of illus- trations so they can be easily selected. LAYOUT AREA The rectangular area on screen in a Canvas docu- ment, which represents the extent of the layout and may cover multi- ple printed pages, depending on the size of paper used for printing. LEADER CHARACTER A character, usually a period (“.”) used to fill space between the character before a tab space and the character immediately following the tab space. LEADER CHARACTER LENGTH The length of the horizontal portion of the witness line of a dimension object. LEADING Space between lines of text, measured in points from the baseline of one line to the next. LENS A special object which applies effects such as filters and mag- nification to an area in a document. LIGHTNESS The amount of black or white in a color. LINE GROUP A set of parallel lines in a hatch pattern that have iden- tical properties. LINE CAP The shape of the end of a pen stroke. LINE JOIN The shape of the pen stroke where two path segments meet. LPI Lines per inch; a measure of halftone screen resolution. MAC OS The Apple Computer operating system used on Macintosh and on compatible personal computers. Mac OS X, which is based on Unix, is Apple’s most recent operating system. Mac OS X Canvas currently runs on Mac OS X and Mac OS (9.0.4+). MACRO OBJECT A vector object that can be used to place copies of itself in documents; the copies remain linked to the original. Left alignment Right alignment Text without kerning (top) and with kerning applied (bottom) 2.30  pica Leader character length Oval used as a lens
Canvas 8 Help: Glossary (8 of 15)      Page #766