The Apple Macintosh II Video Card produces true gray-scale output, in the
form of an analog RS-343 standard video signal. Apple monitors are also
capable of displaying true gray-scale images. The RGB monitor even
displays color information.
Apple's video displays 256 shades of gray (or colors) on an analog
monitor. Some manufacturers have video cards that display up to 786,432
shades of gray or colors. Apple video cards have access to the same source
(16.8 million different shades of gray or colors) as these others--the
differences in the number of gray and color shades is due only to the
amount of memory on the video card.