You may notice some color "shifting" on the Internet.

Computer Monitors today are capable of reproducing millions of colors. The majority of home computer users use 256 display colors. If you create a beautiful and colorful image of a million colors..., the file will be "huge" and the image will not be reproduced the "same way" in many of your users monitors.

Remember..., The "fewer" colors (in your Internet images) ...the smaller the image file size.