This series of short articles explains fundamental concepts of 2D computer images, such as vector art vs. bitmaps, pixels per inch, and color channels. You need to know this stuff in order to work effectively in 3D. These articles demystify some of the confusion around common buzzwords, providing a fuller explanation than you'll find in product documentation and elsewhere. Even if you think you know what a pixel is, it might not be a bad idea to read on....