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Colors can be specified as "none" for terminal's default color, as a name of one of the eight standard colors of ISO/IEC 6429 "black", "red", "green", etc., as an RGB hexadecimal tripplet #RRGGBB for 24-bit TrueColor, or as an integer from 0 to 255. Integers 0 to 7 are the synonyms for the standard colors. Integers 8-15 are used for the so-called bright colors from the aixterm extended 16-color palette. Integers 16-255 are the indexes into xterm extended 256-color palette (usually 6x6x6 cube plus gray ramp). In general, 256-color palette is terminal dependent and sometimes can be changed with OSC 4 sequences, e.g. "\033]4;1;rgb:00/FF/00\033\\". It is the responsibility of the user to verify that the terminal supports the specified colors. PATCH v5 changes: documentation fixed. PATCH v6 changes: documentation fixed. PATCH v7 changes: rebase onto master and fixes after review. PATCH v8 changes: fixes after review.