Converts RBG color from a set of red, green, and blue color components to CMYK color into a set of Cyan, Magenta, Yellow and Black (Key) components.

public ColorRGBtoCMYK(
    int RedValue, 
    int GreenValue, 
    int BlueValue, 
    ref int CyanReturn, 
    ref int MagentaReturn, 
    ref int YellowReturn, 
    ref int BlackReturn
);

Public Sub ColorRGBtoCMYK(
    ByVal RedValue As Integer, 
    ByVal GreenValue As Integer, 
    ByVal BlueValue As Integer, 
    ByRef CyanReturn As Integer, 
    ByRef MagentaReturn As Integer, 
    ByRef YellowReturn As Integer, 
    ByRef BlackReturn As Integer
)