The trouble with a color’s name is that it never really is perceived as the exact same color to two different individuals — especially if they have a stake in a website’s emotional impact. Name a color, and you’re most likely to give a misleading impression. Even something like “blue” is uncertain. To be more precise, it could be “sky blue”, “ocean blue”, “jeans blue” or even “arc welder blue”.
Descriptions vary with personal taste and in context with other colors. We label them “indigo”, “jade”, “olive”, “tangerine”, “scarlet” or “cabaret”. What exactly is “electric lime”? Names and precise shades vary — unless you’re a computer.
When computers name a color, they use a so-called hexadecimal code that most humans gloss over: 24-bit colors. That is, 16,777,216 unique combinations of exactly six characters made from ten numerals and six letters — preceded by a hash mark. Like any computer language, there’s a logical system at play. Designers who understand how hex colors work can treat them as tools rather than mysteries.
Full Story via Smashing Magazine