|ANSI escape codes are a standard for in-band signaling to control the cursor location, color, and other options on text terminals. The ANSI x3.64 standard was released in 1979 and later updated by the 5th edition ECMA-48 standard in 1991, ISO/IEC 6429 in 1992, and ISO-8613-3 in 1995.
|ANSI escape codes are started using \e[ and contain numeric codes separated by semicolons. The escape code is terminated with an 'm'.
|ANSI Color Codes
|ANSI Color Escape Sequences
|ANSI Color Options
|ANSI Color RGB Values
|The 24 bit RGB values used for the 16 ANSI colors differ greatly for each terminal implementation. Below is a system that is both consistent and 12 bit compatible.
|OSC Color Palette
|The OSC color palette is an extension to the ANSI color standard using a modification of the Operating System Command sequence, documented in the Linux console manual as early as 1996. Support has been added by a handful of terminal emulators, most notably xterm. The extension allows changing the default 16 ANSI colors using a 24 bit RGB value in hexadecimal notation.
|To send an OSC color palette code one must print \e]P followed by 1 hexadecimal number indicating one of the 16 ANSI colors, followed by 6 hexadecimal numbers to set a corresponding RGB value. Colors can be reset to their default by printing \e]R. The terminal's default foreground and background color cannot be changed.
|The default blue ANSI color is hard to read on a black background. To set it to a lighter shade of blue one would print "\e]P43333BB", and to display the updated color one would print "\e[22;34m".
|ANSI color support in MUD clients is generally weak. Universally supported codes are 0 and 1, as well as code 30-37.
|Terminal emulators generally support background colors as well as code 4, 5, 7, 9, and 22.
|There is no universal standard for the detection or negotiation of ANSI color support. The following methods exist:
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|Clients supporting ANSI color
|Virtually all MUD clients and terminal emulators support ANSI color.
|Comparison of MUD codebases - Mudpedia contains a list of MUD servers with ANSI color support.
|256 color parser - Handles ANSI 16 colors and xterm 256 colors.