The JPG or JPEG (Joint Photographic Experts Group) file format is designed for compressing either full-color or grayscale images. This compression method does not work well on non-realistic images, such as cartoons or line drawings. Some advantages of using the JPEG format are:  • High compression ratios are possible for faster downloading of images as part    of a web page.  • The JPEG format gives excellent results in most photographs.  • JPEG supports 24-bit "true color" to grayscale. The JPEG format does not support transparency. You can matte the background color of an image to match the color of a web page. This procedure will simulate the appearance of a background transparency.  GIF           JPEG           TIF           BMP JPEG uses a technique called, Discrete Cosine Transformation to produce a sliding scale of compression. This "lossy" compression method throws away part of the image in the process. As a result, the image quality can be affected.