AS3 Color Utility Functions

Utility for Color functions, like RGB to CMYK, RGB to HSV, HSV to RGB, ColorTransformation, int color value to RGB and Color Calculations.

package
{
import flash.geom.ColorTransform;
public class ColorUtil
{
public static function colorTransform( rgb:uint=0, amount:Number=1.0, alpha:Number=1.0 ):ColorTransform
{
amount = ( amount > 1 ) ? 1 : ( amount 1 ) ? 1 : ( alpha > 16 ) & 0xff ) * amount;
var g:Number = ( ( rgb >> 8 ) & 0xff ) * amount;
var b:Number = ( rgb & 0xff ) * amount;
var a:Number = 1-amount;
return new ColorTransform( a, a, a, alpha, r , g , b, 0 );
}
public static function subtract( col1:uint , col2:uint ):uint
{
var colA:Array = toRGB( col1 );
var colB:Array = toRGB( col2 );
var r:uint = Math.max( Math.max( colB[0]-(256-colA[0]) , colA[0]-(256-colB[0]) ) , 0 );
var g:uint = Math.max( Math.max( colB[1]-(256-colA[1]) , colA[1]-(256-colB[1]) ) , 0 );
var b:uint = Math.max( Math.max( colB[2]-(256-colA[2]) , colA[2]-(256-colB[2]) ) , 0 );
return r << 16 | g << 8 | b;
}
public static function sum( col1:uint , col2:uint ):uint
{
var c1:Array = toRGB( col1 );
var c2:Array = toRGB( col2 );
var r:uint = Math.min( c1[0]+c2[0] , 255 );
var g:uint = Math.min( c1[1]+c2[1] , 255 );
var b:uint = Math.min( c1[2]+c2[2] , 255 );
return r << 16 | g << 8 | b;
}
public static function sub( col1:uint , col2:uint ):uint
{
var c1:Array = toRGB( col1 );
var c2:Array = toRGB( col2 );
var r:uint = Math.max( c1[0]-c2[0] , 0 );
var g:uint = Math.max( c1[1]-c2[1] , 0 );
var b:uint = Math.max( c1[2]-c2[2] , 0 );
return r << 16 | g << 8 | b;
}
public static function min( col1:uint , col2:uint ):uint
{
var c1:Array = toRGB( col1 );
var c2:Array = toRGB( col2 );
var r:uint = Math.min( c1[0] , c2[0] );
var g:uint = Math.min( c1[1] , c2[1] );
var b:uint = Math.min( c1[2] , c2[2] );
return r << 16 | g << 8 | b;
}
public static function max( col1:uint , col2:uint ):uint
{
var c1:Array = toRGB( col1 );
var c2:Array = toRGB( col2 );
var r:uint = Math.max( c1[0] , c2[0] );
var g:uint = Math.max( c1[1] , c2[1] );
var b:uint = Math.max( c1[2] , c2[2] );
return r << 16 | g << 8 | b;
}
public static function rgb(r:uint, g:uint, b:uint):uint
{
return r << 16 | g <> 16 & 0xFF;
var g:uint = rgb >> 8 & 0xFF;
var b:uint = rgb & 0xFF;
return [r,g,b];
}
public static function RGBtoHSV( r:Number, g:Number, b:Number ):Array
{
r/=255; g/=255; b/=255;
var h:Number=0, s:Number=0, v:Number=0;
var x:Number, y:Number;
if(r>=g) x=r; else x=g; if(b>x) x=b;
if(r<=g) y=r; else y=g; if(b<y) y=b;
v=x;
var c:Number=x-y;
if(x==0) s=0; else s=c/x;
if(s!=0){
if(r==x){
h=(g-b)/c;
} else {
if(g==x){
h=2+(b-r)/c;
} else {
if(b==x){
h=4+(r-g)/c;
}
}
}
h=h*60;
if(h<0) h=h+360;
}
return [ h, s, v ];
}
public static function RGBtoCMYK( r:Number, g:Number, b:Number ):Array
{
var c:Number=0, m:Number=0, y:Number=0, k:Number=0, z:Number=0;
c = 255 – r;
m = 255 – g;
y = 255 – b;
if(r<g) k=r; else k=g; if(b 0)
{
c = c – k;
m = m – k;
y = y – k;
}
c = Math.round(c / 255 * 100);
m = Math.round(m / 255 * 100);
y = Math.round(y / 255 * 100);
k = Math.round(k / 255 * 100);
return [ c, m, y, k ];
}
public static function HSVtoRGB( h:Number, s:Number, v:Number ):Array
{
var r:Number=0, g:Number=0, b:Number=0;
var i:Number, x:Number, y:Number, z:Number;
if(s < 0) s=0;
if(s > 1) s=1;
if(v < 0) v=0;

if(v > 1) v=1;
h = h % 360; if (h > 0) h += 360; h /= 60
i = h > > 0;
x = v * (1 – s); y = v * (1 – s * (h – i)); z = v * (1 – s * (1 – h + i));
switch(i){
case 0 : r=v; g=z; b=x; break;
case 1 : r=y; g=v; b=x; break;
case 2 : r=x; g=v; b=z; break;
case 3 : r=x; g=y; b=v; break;
case 4 : r=z; g=x; b=v; break;
case 5 : r=v; g=x; b=y; break;
}
return [ r*255>>0, g*255>>0, b*255>>0 ];
}
}
}