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Images on the Web

Images often account for most of the downloaded bytes on a web page and also often occupy a significant amount of visual space. As a result, optimizing images can often yield some of the largest byte savings and performance improvements for your website: the fewer bytes the browser has to download, the less competition there is for the client's bandwidth and the faster the browser can download and render useful content on the screen.

Determining file format. There are two main file formats that are used for still images on the web: JPEG and GIF

JPGs save greater detail and gradation than GIFs

You and your client should agree on specific limits regarding file size before the Development phase. Large image files can cause long download times.

To reduce the filesize of an image

Current web standards incloude browser support

Most HTML editors have the 256 color palette as the standard choices for backgrounds