plgcol0: Returns 8-bit RGB values for given color from color map0

The PLplot Plotting Library: Programmer's Reference Manual
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### `plgcol0`: Returns 8-bit RGB values for given color from color map0

`plgcol0` (icol0, r, g, b);

Returns 8-bit RGB values (0-255) for given color from color map0 (see the Section called Color Map0 in Chapter 3). Values are negative if an invalid color id is given.

`icol0` (`PLINT`, input) Index of desired cmap0 color. `r` (`PLINT *`, output) Pointer to 8-bit red value. `g` (`PLINT *`, output) Pointer to 8-bit green value. `b` (`PLINT *`, output) Pointer to 8-bit blue value.

Redacted form: `plgcol0(icol0, r, g, b)`

This function is used in example 2.

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`plgchr`: Get character default height and current (scaled) height | Up | `plgcolbg`: Returns the background color (cmap0[0]) by 8-bit RGB value