0xRRGGBB

0xRRGGBB is a common hexadecimal notation used in programming to represent a 24-bit color value. After the 0x prefix, six hexadecimal digits encode the red, green, and blue components in the order red, green, blue. Each pair ranges from 00 to FF, corresponding to 0 to 255 for the color channels. For example, 0xFF0000 denotes pure red, 0x00FF00 denotes pure green, and 0x0000FF denotes pure blue; 0x80A0C0 encodes a mid-level red, a medium-high green, and a light blue.

In typical use, the 0xRRGGBB value is stored as a 24-bit integer. To extract the individual components in code, red can be obtained with (color >> 16) & 0xFF, green with (color >> 8) & 0xFF, and blue with color & 0xFF. When alpha (transparency) is required, 32-bit formats may adopt layouts such as 0xAARRGGBB or 0xRRGGBBAA, where an additional byte encodes alpha, but these are separate from the plain 0xRRGGBB notation.

The 0xRRGGBB scheme is distinct from CSS color notations, which use #RRGGBB or rgb() functions. In graphics programming, 0xRRGGBB is favored for its compact representation and ease of bitwise manipulation, especially in shaders, game engines, and low-level graphics libraries. The convention is widely understood, though exact endianness and packing can vary between platforms and APIs.