The PLplot Plotting Library: Programmer's Reference Manual
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plscmap1a: Set color map1 colors using 8-bit RGB values and double alpha values.

plscmap1 (r, g, b, a, ncol1);

Set color map1 colors using 8-bit RGB values (see the Section called Color Map1 in Chapter 3) and double alpha values. This also sets the number of colors.

r (PLINT *, input)

Pointer to array with set of unsigned 8-bit integers (0-255) representing the degree of red in the color.

g (PLINT *, input)

Pointer to array with set of unsigned 8-bit integers (0-255) representing the degree of green in the color.

b (PLINT *, input)

Pointer to array with set of unsigned 8-bit integers (0-255) representing the degree of blue in the color.

a (PLFLT *, input)

Pointer to array with set of double values (0.0-1.0) representing the alpha value of the color.

ncol1 (PLINT, input)

Number of items in the r, g, b, and a arrays.

This function is used in example 31.

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plscmap1: Set color map1 colors using 8-bit RGB valuesUpplscmap1l: Set color map1 colors using a piece-wise linear relationship