Color has three attributes: hue, intensity (saturation), and gradation (value). The two color models are RGB and CMYK. RGB is additive color, and is used by light-emitting devices like monitors and televisions. In this model, white is made up of all colors, and black is the absence of color. CMYK is subtractive color, and is a property of reflective (non-light-emitting) objects, such as paper. In this model, white is the absence of color, and black is made up of all colors. In CMYK, ( Cyan, Magenta, Yellow and Black) Color percentages used determines the color output produced on the Print media.
There are two types of computer graphics: raster (bitmap), such as JPEG (Joint Photographic Experts Group); and vector, such as EPS. These are non-proprietary formats, so they can be read by any vector or bitmap program. For example, if you're creating a file in Adobe Illustrator, and you save it in Illustrator's .ai format, only certain Adobe products will be able to read it. If you save it as an EPS, though, it can be read by other programs, such as QuarkXPress.
EPS (Encapsulated PostScript) supports both vector and bitmap images, and can handle color separations. TIFF (Tagged Image File Format) also handles color separations, but only supports bitmaps.
Clip art consists of small illustrations that are not copyrighted. They are either in public domain, or sold with a user's license.