The Most Important Thing to Remember About the Color of the Character-Generated

The most important thing to remember about the color of the character-generated lettering you key over a scene is to make sure:

A) the color is complimentary to the background color/s.
B) the color contrast is adequate.
C) the color is always red or yellow.
D) your key has a sharp, defined border
E) you use one of the three primary colors (red, green, blue)