However, before you get carried away with putting images on your page, remember they can take up a lot of space which may cause a page to load slower. If photos and graphics are done properly and file size kept small, they will add spirit to your page, and won't have an adverse affect on load time. There is much more to preparing an image for web publishing than meets the eye.
File size is critical, and quality is essential.
GIF supports color and various resolutions. GIF files use 256 colors or less, can be animated, and generally display edges, lines, and details more clearly than JPG files. Use GIF files for images where edge clarity and overall sharpness are needed, for small size images such as buttons for navigation, black and white images, animations, and transparent images. JPG files should be used for photographs, images that should be natural looking, when a large number of colors is needed or great detail, or for images with large dimensions. In preparing a graphics file for use on a web site, there are several things to keep in mind.