2. RGB color is composed of
3 channels on computer screens…
Red Green Blue
0-255 0-255 0-255
0 - Black White - 255
3. They are called:
Additive colors
because the colors combine to form white
They do not mix together like inks or paint
which are… subtractive colors
where you subtract colors to get to white
4. The full strength of each color is displayed
when its channel is 255 and others are 0.
Red Green Blue
R G B
5. The full strength of each color is displayed
when its channel is 255 and others are 0.
Red
255, 0, 0
R G B
6. The full strength of each color is displayed
when its channel is 255 and others are 0.
Green
0, 255, 0
R G B
7. The full strength of each color is displayed
when its channel is 255 and others are 0.
Blue
0, 0, 255
R G B
9. When all sliders are 255,
the result is white.
White
255, 255, 255
R G B
10. When all sliders are the same
between 0-255, the result is a gray.
Gray
151, 151, 151
R G B
11. So, millions of colors can be created
from the combinations of channel values.
209, 96, 171
12. So, millions of colors can be created
from the combinations of channel values.
232, 125, 35
13. But web uses a hexadecimal system to
display numbers from 0-255.
232, 125, 35
Instead of…
It translates to…
e8, 7d, 23
14. Instead of…
0 1 2 3 4 5 6 7 8 9
a base 10 system – that we normally use.
It uses…
0 1 2 3 4 5 6 7 8 9 A B C D E F
a base 16 system – A-F equals 10-15
10 11 12 13 14 15
