David A. Windham thumbnail

about color…and how images differ online

It depends on the users display, settings, processor, and video cards.

The average monitor resolution is 72dpi (dots per inch)
(printers are 300-1200dpi)

A pixel always refers to an individual picture element on an LCD or CRT device (screen)
these are common computer monitor settings
– 1280 x1024
– 1024 x 768

I run – 1920×1200

Computer monitors use the RGB model
(printers use the CMYK model)
– red, green, and bue light in various amounts create the range of colors from black to white.
– use 24 to 32 bits of info per pixel
– at 24 bits, each channel (R,G,B) gets 8 bits
– since a bit is bianary, it 2 to the 8th = 256
– 256 shades of each color (256x256x256) = 16,777,216 possible colors