Using Photoshop Adjustments and Filters
Step One
Start by creating a new Photoshop file that is 1024 by 1024 pixels. Use images from the web or ones that you have previously created, to make five different files that illustrate your understanding of how filters and image adjustments work. Add them to your Keynote slide show.
I have one video demonstration that show you exactly how to work with Image adjustments and filters:
Understanding Photoshop Adjustments and Filters