1. Digital File Formats By Ali Aslam

2. JPEG JPEG Stands for Joint Photographic Experts Group. JPEG uses a lossy compression routine. Lossy compression means that the image loses quality and information each time it is saved JPEG compression is used in a number of image file formats. JPEG is the most common file used by digital cameras.

3. PDF Share files with others who don't have the same software. Share files that will look the same fonts and layouts on multiple computer systems. Create interactive forms that can be shared via email and the Web.

4. PNG PNG Stands for Portable Network Graphics. PNG Offers better compression than GIF. It can be used for 24 bit pictures (16+ million colours.