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Predicate ansi_get_color/2
 ansi_get_color(+Which, -RGB) is semidet
Obtain the RGB color for an ANSI color parameter. Which is either a color alias or an integer ANSI color id. Defined aliases are foreground and background. This predicate sends a request to the console (user_output) and reads the reply. This assumes an xterm compatible terminal.
Arguments:
RGB- is a term rgb(Red,Green,Blue). The color components are floats in the range 0.0..1.0. They are sRGB encoded, as that is what the terminal reports; linearise them before doing colour arithmetic that assumes light intensities.
Compatibility
- Up to version 10.1.13 the components were integers in the range 0..65535. The terminal reports one to four hexadecimal digits per component, so that range suggested a precision the reply does not have, and it clashed with the rgb/3 term of win_window_color/2, whose components are in the range 0..255.
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