A built-in tool or plug-in that produces a special effect (Fx). Can range from something as simple as a blurred image to wild, psychedelic patterns, distortions, and artistic effects.

A software module that can be added to a program to extend its functionality. It's like a program inside a program.

Allows a hardware device, such as a scanner (or digital camera) to communicate with image processing software. Photoshop uses the TWAIN standard (rule).

The smallest element of an image that can be individually processed in a video display system; looks like a square of color. Each pixel can either be 1-dimensional or have depth which determines how many colors a monitor can display.

 A grid of individual pixels (rasters or bits) in rows and columns (bitmap).