Online image editing software is getting better and better. It won’t be long before web applications like PIXLR are on par with powerful desktop applications like Adobe Photoshop. I used PIXLR Editor to create the banner on this blog. If you know how to use Photoshop then you will have no problem with this application. Most of the basic functions are there; layers, selection tools, as well as the ability to add filters and text to an image. The user can also save the file to either your desktop or to the cloud in multiple formats such as .png, .jpg, and also as its own file format which maintains layers.
The software is a little complicated for lower level grades but could be integrated in a middle and high school course such as digital photography.
Mike Grant 