Vector Vector images are mathematical descriptions of an image. Because vector images consist of instructions, rather than pixels, they are usually smaller than comparable Raster images. As you might expect, these are the best images to use for presentations that will be delivered on different output devices. Other Terms Color depth Refers to the number of colors in each pixel. This is the standard graphic format for the web.
Resolution Refers to the physical information space of a given output device.
For example, a computer display typically has between 72-120 pixels per inch. The monitor usually is between 15-21 inches, diagonally.