Posted By

IsoJon on 07/02/10

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Last Edited at 07/02/10 11:02pm

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Change Image from Color to Grayscale

/ Published in: ActionScript 3

With this snippet you can change your color image from the library to grayscale (or it can be augmented to use any other color transform)

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// GRAYSCALE AND IMAGE snippet

// "Bit" is the linkage ID of the bitmap in the Library
var colorMC : Sprite = new Bit();

// sendToGray takes 3 parameters width, height, and Sprite
addChild( sendToGray( 306, 176, colorMC ));

function sendToGray( w:int, h:int, drawItem:Sprite ) : Bitmap
{
	var myBitmapData : BitmapData = new BitmapData( w, h );
	myBitmapData.draw( drawItem );
	
	var bmp : Bitmap = new Bitmap( setGrayScale(myBitmapData) );
	
	return bmp;
}

function setGrayScale( obj:BitmapData ) : BitmapData
{
    var rLum : Number = 0.2225;
    var gLum : Number = 0.7169;
    var bLum : Number = 0.0606; 
    
    var matrix:Array = [ rLum, gLum, bLum, 0, 0,
                         rLum, gLum, bLum, 0, 0,
                         rLum, gLum, bLum, 0, 0,
                         0,    0,    0,    1, 0 ];
    
    var filter:ColorMatrixFilter = new ColorMatrixFilter( matrix );
    obj.applyFilter( obj, new Rectangle( 0,0,obj.width,obj.height ), new Point(0,0), filter );
    
    return obj;
}

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