The PLplot Plotting Library: Programmer's Reference Manual
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plscol0a: Set a given color from color map0 by 8 bit RGB value and double alpha value.

plscol0 (icol0, r, g, b, a);

Set a given color by 8-bit RGB value and double alpha value for color map0 (see the Section called Color Map0 in Chapter 3). Overwrites the previous color value for the given index and, thus, does not result in any additional allocation of space for colors.

icol0 (PLINT, input)

Color index. Must be less than the maximum number of colors (which is set by default, by plscmap0n, or even by plscmap0).

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.

a (PLFLT, input)

double value (0.0-1.0) representing the alpha value of the color.

This function is used in example 30.

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plscol0: Set a given color from color map0 by 8 bit RGB valueUpplscolbg: Set the background color by 8-bit RGB value