The PLplot Plotting Library: Programmer's Reference Manual
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plscolbga: Set the background color by 8-bit RGB value and double alpha value.

plscolbga (r, g, b, a);

Set the background color (color 0 in color map 0) by 8-bit RGB value (see the Section called Color Map0 in Chapter 3) and double alpha value.

r (PLINT, input)

Unsigned 8-bit integer (0-255) representing the degree of red in the color.

g (PLINT, input)

Unsigned 8-bit integer (0-255) representing the degree of green in the color.

b (PLINT, input)

Unsigned 8-bit integer (0-255) representing the degree of blue in the color.

a (PLFLT, input)

double value (0.0-1.0) representing the alpha value of the color.

This function is used in example 31.

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plscolbg: Set the background color by 8-bit RGB valueUpplscolor: Used to globally turn color output on/off