<cfscript>
// Convert RGB values to HSV values for a given triplet of color information
// 
// ColdFusion MX Routine written by Brian Ghidinelli (http://www.ghidinelli.com)
//
// Usage:  resultStructure = RGBtoHSV(red:0-255, green:0-255, blue:0-255);

function RGBtoHSV(r, g, b)
{
	result = structNew();

	// normalize values
	r = r / 255;
	g = g / 255;
	b = b / 255;

	// find min and max
	min = min(b, min(r, g));
	max = max(b, max(r, g));
	v = max;
	
	delta = max - min;
	if( max NEQ 0 )
		s = delta / max;		// s
	else {
		// r = g = b = 0		// s = 0, v is undefined
		s = 0;
		h = -1;
		
		result.h = h;
		result.s = s;
		result.v = v;
		return result;
	}

	// CF can't handle Infinite values well, so approximate the zero
	if (delta EQ 0)
		delta = 0.0000001;
		
	if(r EQ max)
		h = (g - b) / delta;		// between yellow & magenta
	else if (g EQ max)
		h = 2 + (b - r) / delta;	// between cyan & yellow
	else
		h = 4 + (r - g) / delta;	// between magenta & cyan

	h = h * 60;						// degrees

	if (h LT 0)
		h = h + 360;

	result.h = int(h);
	result.s = int(s*100)/100;
	result.v = int(v*100)/100;
	return result;
}

</cfscript>