GIF images are the most widely used graphic format on the web. GIF images display up to 256 colors. Glow A glow is the opposite of a shadow in that it creates a surrounding highlight of an image. A high radiance creates a soft, subtle glow and a low radiance creates a hard, bright glow, such as a neon glow. Gradient A gradient is a gradual transition of colors.
Many metallic images are gradients.
Web images that use gradient fills as a special effect should be saved in a JPEG rather than a GIF format. The bottom-most layer on a web page, usually with either a design or color that highlights the above copy. A small graphic can be tiled to create a background texture for a web page. In print design, a grayscale graphic image appears to be black, white, and shades of gray, but it only uses a single color ink.