optimising - any photos included in your web site will be optimised for the web for faster download speeds. This page shows an example of the opimisation at work and some bad examples of photo optimising
Web
Photo Optimisation
example If a photo isn't optimised for the web then it will take longer to download and the viewer is likely to get bored waiting. However if it is over optimised even though it will download quickly it will look poor.
All photos supplied for including in your web site design will be optimised accordingly. Here is an example of photo optimisation for the web at work (time is approximate based on a 56k dial-up modem):

Web Optimised Photo
There's some compression noise compared to the original but for the reduction in file size it is very acceptable.
12 K ~ 4 seconds

Badly Optimised Photo 1
This image has been compressed too much and picture quality is poor.
6 K ~ 2 seconds

Badly Optimised Photo 2
This image has been saved using GIF a common web format. Not great for photos.
8 K ~ 3 seconds
