From BioRUST Wiki
Photoshop is a large and initially very confusing program to use. Whilst it is usually good practice to read the help file and/or manual before using every unfamiliar function, the text-presentation of such methods can seem a little stale and difficult to visualize. The aim of this section is to provide a contextual guide to all the palettes available in Photoshop, providing clear visual illustrations that will enable you to understand the program better.