February 2006
Intermediate to advanced
826 pages
63h 42m
English
Content preview from Web Design in a Nutshell, 3rd Edition
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The web palette in numbers
In web production, we most often manipulate colors in the web palette by their numerical values. The web palette recognizes 6 shades of red, 6 shades of green, and 6 shades of blue, resulting in 216 possible color values (6 × 6 × 6 = 216). This is sometimes referred to as the 6 × 6 × 6 color cube.
In image editing programs, colors are specified by their decimal RGB values on a scale from 0 to 255. Web-safe colors use the following six values: 0, 51, 102, 153, 204, and 255 (ranging from black to white) for each color channel.
In HTML and CSS, colors are identified by the hexadecimal (base-16) equivalents of the same RGB values: 00, 33, 66, 99, CC, and FF. See Appendix D for a more thorough explanation of hexadecimal notation.
Table 28-2 shows the decimal, hexadecimal, and percentage values for each of the six component values in the web palette.
Table 28-2. Numerical values for web palette colors
|
Decimal |
Hexadecimal |
Percentage |
|---|---|---|
|
0 (darkest) |
00 |
0% |
|
51 |
33 |
20% |
|
102 |
66 |
40% |
|
153 |
99 |
60% |
|
204 |
CC |
80% |
|
255 (lightest) |
FF |
100% |
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