void pdf_setcolor (int pdf object, string type, string colorspace, double c1 [, double c2 [, double c3 [, double c4]]])
Set the current color space and color. The parameter type can be "fill", "stroke", or "both" to specify that the color is set for filling, stroking or both filling and stroking. The parameter colorspace can be gray, rgb, cmyk, spot or pattern. The parameters c1, c2, c3 and c4 represent the color components for the color space specified by colorspace. For gray only c1 is used. For rgb parameters c1, c2, and c3 specify the Red, Green amd Blue values respectively. For cmyk parameters c1, c2, c3, and c4 specify the Cyan, Magenta, Yellow and Black values respectively. For spot c1 specifies a spot color handles returned by pdf_makespotcolor() and c2 specifies a tint value between 0 and 1. For pattern c1 specifies a pattern handle returned by pdf_begin_pattern().