CFLib.org – Common Function Library Project

Description:
Returns the opposite of a color.

Return Values:
Returns a string.

Example:

<cfoutput>#reverseColor("ffee22")#</cfoutput>

Parameters:

Full UDF Source:

/**
 * Returns the opposite of a color.
 * 
 * @param startingColor      RGB value minus the #. (Required)
 * @return Returns a string. 
 * @author Matt Liotta (mliotta@r337.com) 
 * @version 1, November 18, 2003 
 */
function reverseColor(startingColor) {
    var start = InputBaseN(startingColor, 16);
    var red = InputBaseN("FF", 16);
    var green = InputBaseN("FF00", 16);
    var blue = InputBaseN("FF0000", 16);
    var tmp = "";

    invertRed = BitAnd(BitXOR(start, red), red);
    invertGreen = BitAnd(BitXOR(start, green), green);
    invertBlue = BitAnd(BitXOR(start, blue), blue);

    tmp = invertRed + invertGreen + invertBlue;
    tmp = Ucase(FormatBaseN(tmp, 16));
    if(len(tmp) is 4) tmp = "00" & tmp;

    return tmp;
}