String (file-type)
jpg
Purpose
The ImageType parameter specifies the type of image that is displayed on your Web pages. The valid values are the default .jpg (Joint Photographic Experts Group) file type, the .png (Portable Network Graphics) file type, and the .gif (Graphics Interchange Format) file type.
Pictures on Web pages can be types .gif (Graphics Interchange Format), ..jpg (Joint Photographic Experts Group), or ..png (Portable Network Graphics) only.
Hint
Set this parameter to png if you want to use images with lossless compression on your Web pages. Portable Network Graphics (.png) files provide greater clarity and no loss of definition.
Portable Network Graphics (.png) files may be larger than Joint Photographic Experts Group (.jpg) image files.