The PLplot Plotting Library: Programmer's Reference Manual
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plgcolbga: Returns the background color (cmap0[0]) by 8-bit RGB value and double alpha value.

plgcolbga (r, g, b, a);

Returns the background color (cmap0[0]) by 8-bit RGB value and double alpha value.

r (PLINT *, output)

Pointer to an unsigned 8-bit integer (0-255) representing the degree of red in the color.

g (PLINT *, output)

Pointer to an unsigned 8-bit integer (0-255) representing the degree of green in the color.

b (PLINT *, output)

Pointer to an unsigned 8-bit integer (0-255) representing the degree of blue in the color.

a (PLFLT *, output)

Pointer to PLFLT alpha value.

This function is used in example 31.

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plgcolbg: Returns the background color (cmap0[0]) by 8-bit RGB valueUpplgcompression: Get the current device-compression setting