HEXkoodien

Hexkoodien, or hex color codes, are a common way to specify colors in computing by representing red, green, and blue values with hexadecimal digits. Each color is defined by combining three 8-bit channels (R, G, B), and six hexadecimal digits are typically used to encode them.

A hex color code usually begins with a hash symbol and is written as six digits, using the digits 0–9 and the letters A–F. For example, #ff0000 represents red, #00ff00 represents green, and #0000ff represents blue. Hex codes are case-insensitive, and many designers and developers write them in lowercase or uppercase interchangeably. A three-digit shorthand form is also common, such as #f00 for red, which expands to #ff0000 when used.

Some contexts support an alpha channel that indicates transparency. Eight-digit hex codes extend the standard form with two additional digits, for example #RRGGBBAA, where AA encodes opacity. There is also a four-digit shorthand variant like #RGBA that expands to #RRGGBBAA. These alpha-inclusive formats are increasingly supported in modern web standards and graphics tools.

Common uses include styling colors in web pages (HTML/CSS), defining colors in SVG and other graphic formats, and configuring color values in software development. Hex codes represent colors in the sRGB color space and are not themselves a color management or color-space specification; conversions to other spaces or gamma corrections require additional processing.