plscolbga: Set the background color by 8-bit RGB value and PLFLT alpha transparency value.

`plscolbga`: Set the background color by 8-bit RGB value and PLFLT alpha transparency value.
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`plscolbga`: Set the background color by 8-bit RGB value and PLFLT alpha transparency value.

`plscolbga (`	`r` ,
	`g` ,
	`b` ,
	`alpha` `)`;

Set the background color (color 0 in cmap0) by 8-bit RGB value and PLFLT alpha transparency value (see the section called “Color Map0”).

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.
alpha (PLFLT, input): Value of the alpha transparency in the range (0.0-1.0).

This function is used in example 31.

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`plscolbg`: Set the background color by 8-bit RGB value	Home	`plscolor`: Used to globally turn color output on/off