Building on Volumes 1 and 2, these reference sheets help Digital Photosgraphy and Computer Graphics students remember techniques that you taught in the past (especially after returning from a break). These are not lessons, but techniques already learned that might be reused in another more advanced lesson, for example. They include screenshots and are in color and are very effective in a reference binder and online. This volume includes how to create a vignette for a photo, how to turn a photo into a graphic style illustration, how to add a texture layer, and how to use layer styles. (It is helpful to have Volume 1 with Volume 3.) I would be interested in knowing what techniques you feel like you have to reteach to add to Volume 4.