Here is a table listing typical file formats used online for websites and what format best suits what purpose.
|JPG, JPEG||16 million colors||
|PNG||8 bit||8 bit color, similar to Gif but can produce a smaller file size|
|*24 bit||24bit color, similar to Jpg but allows alpha transparency|
|*32 bit||32bit colour and allows alpha transparency|
|Fireworks native file format||Contains Fireworks-specific data and is editable using Fireworks application|
* requires a hack for alpha transparency to be viewed on certain browsers
- PNG 8 – competitor to GIF but is better quality than GIF.
- PNG 24, 32 is not supported in IE6 and lower. Causes transparency not to show properly.