For example, images can resized on the browsers first to a web friendly format before uploading to web server etc. Buidling a drag and drop tool allows users to crop, resize image on the fly on the browser is possible. Or building web client app that lets users to edit their photos before uploading to servers etc.
The few methods and usage as follows:
var image = google.gears.factory.create(‘beta.image’, ’1.0′);
void resize(width, height)
void crop(x, y, width, height)
void drawImage(image, x, y)