Optimizing graphics is very important when it comes to file size, it cuts down on the overall page size, but also saves bandwidth by having smaller files, which makes the page load much faster.
Graphics are used on websites in many ways but they are mainly used to make a site more memorable and to make it stand out to people.
Graphics can become major content on websites. Graphics sometimes can convey just as much information as text alone. Many times graphics convey the information in a more easy to understand form than just using text alone.
Graphics appear differently from computer to computer no doubt, but the biggest issue is how the colors appear and whether the graphics will fit within the monitor screen. Color is probably one of the biggest issue I have faced even when I’ve used colors that are web-safe. Between my laptop and desktop computer there are some major differences that I’ve noticed. You’ve really got to be careful there because some colors that look normal on one screen look neon or just plain awful on the other.