Because a visitor has to download every one of your images to correctly view your webpage, image processing is of paramount importance. The term “Image Processing” is used here in the sense of optimizing your image's quality with respect to its file size. The JPEG picture format lets you compress you image. This means that you can make your image file size smaller which is very useful for download times. However, there is a price to pay for this compression. JPEG compression is not perfect. This means that as you compress your image, it looks more and more blurred and grainy. The Image Preview Dialog has the tools you will require to tweak your image to allow for the perfect file size to image quality trade off.
Give your Image a Transparent Color.
Compress your Image’s File Size.
Use LOWSRC Images with your Images.
Change the Format of an Image (i.e. GIF to JPEG etc.)