plgcolbg: Returns the background color (cmap0[0]) by 8-bit RGB value

The PLplot Plotting Library: Programmer's Reference Manual
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### `plgcolbg`: Returns the background color (cmap0[0]) by 8-bit RGB value

`plgcolbg` (r, g, b);

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

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`plgcol0`: Returns 8-bit RGB values for given color from color map0 | Up | `plgcompression`: Get the current device-compression setting