Promoting DV Skills in Schools        Moving Image Theory
  1 Pixel   2 Digital Colour   3 RGB   4 HSL   5 Frame Size   6 Frame Rate   7 PAL   8 Interlacing   9 Timecode   10 Summary  

03 Red Green Blue model [3min 30s]

8.3MB video file size too large for web

Colours are describe using digital values.
The most commonly used method is the RGB model
RED, GREEN, BLUE

The intensity of each colour can be controled by
the Visual Display Unit [VDU] in 256 steps
So with all three colours set to ZERO
the screen appears BLACK
Increase the RED on its own up to the maximum value of 255
and the screen will become bright RED


Single colors from 0 to max.        Gray = All 3 0-max
No RED GREEN BLUE
14 #ff0000 #00ff00 #0000ff
13 #ee0000 #00ee00 #0000ee
12 #dd0000 #00dd00 #0000dd
11 #cc0000 #00cc00 #0000cc
10 #bb0000 #00bb00 #0000bb
09 #aa0000 #00aa00 #0000aa
08 #880000 #008800 #000088
07 #770000 #007700 #000077
06 #660000 #006600 #000066
05 #550000 #005500 #000055
04 #440000 #004400 #000044
03 #330000 #003300 #000033
02 #220000 #002200 #000022
01 #110000 #001100 #000011
00 #000000 #000000 #000000
No Gray
14 #ffffff
13 #eeeeee
12 #dddddd
11 #cccccc
10 #bbbbbb
09 #aaaaaa
08 #888888
07 #777777
06 #666666
05 #555555
04 #444444
03 #333333
02 #222222
01 #111111
00 #000000

In the table above, each of the three colours are increased in brightness individually.
In the column on right all the colours are increased in intensity together.
Yet all we see is black through gray to white.
Proving black gray and white are created with an equal mixture of red, green and blue.

So how do we get all different colours?
Yellow is an equal mix of Red and Green
Cyan is an equal mix of Green and Blue
Magenta is an equal mix of Blue and Red

pixel animation
COLOUR RED GREEN BLUE
RED 255 0 0
YELLOW 255 255 0
GREEN 0 255 0
CYAN 0 255 255
BLUE 0 0 255
MAGENTA 255 0 255