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Hexadecimal RGB colour codes.

Colours from the RGB Pallette. Notice how the Red, Green and Blue hexadecimal values change relative to one another giving different colours.

FFFF11
FFDD11
FFBB11
FF9911
FF7711
FF5511
FF3311
FF1111
DDFF11
DDDD33
DDBB33
DD9933
DD7733
DD5533
DD3333
DD1133
BBFF11
BBDD33
BBBB55
BB9955
BB7755
BB5555
BB3355
BB1155
99FF11
99DD33
99BB55
999977
997777
995577
993377
991177
77FF11
77DD33
77BB55
779977
777799
775599
773399
771199
55FF11
55DD33
55BB55
559977
557799
5555BB
5533CC
5511BB
33FF11
33DD33
33BB55
339977
337799
3355CC
3333DD
3311DD
11FF11
11DD33
11BB55
119977
117799
1155BB
1133DD
1111FF

It is the proportion of these three elements that gives a colour its hue and the sum of these elements that gives the luminance of the colour.

Using the fade from white through blue to black as an example notice how as the sum of the three components decreases the colour darkens

FFFFFF
EEEEFF DDDDFF
CCCCFF
BBBBFF AAAAFF
9999FF
8888FF 7777FF
6666FF
5555FF 4444FF
3333FF
2222FF 1111FF
0000FF
0000EE 0000DD
0000CC
0000BB 0000AA
000099
000088 000077
000066
000055 000044
000033
000022 000011

You may like to download the Huey 1.2.0 Freeware - RGB to Hex converter