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 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.

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