Gamma correction is one of those buzz words that are really easy in
terms of theory and math but confusing in how they are applied in
practice. As a consequence, it is largely ignored by many graphics
practicioners. This illustrated 10 page article is my attempt at
clarifying gamma correction in the context of 3D CGI by answering most
of the typical questions: "What is gamma? Why do we have it? When should I perform gamma correction? And what happens if I just ignore it?"