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    <pre><code>// Here's how I did it. I wrote &amp; tested this in Flash CS4. // I rambled about this technique in my blog: // http://blog.zacharcher.com/2007/10/13/understanding-colormatrixfilter/ // The goal is to create a simple black-and-white gradient, then tween its ColorTransform, // rather than redraw a new gradient every frame. // I'm going to use Tweener as my tweening engine because I'm used to it. // Download from here: http://code.google.com/p/tweener/downloads/list import caurina.transitions.Tweener; import caurina.transitions.properties.ColorShortcuts; ColorShortcuts.init(); // First, create a Shape with a gradient fill. var shp:Shape = new Shape(); var mtx:Matrix = new Matrix(); // This matrix is needed for Shape.beginGradientFill() mtx.createGradientBox( stage.stageWidth, stage.stageHeight, Math.PI/2 ); with( shp.graphics ) { beginGradientFill( GradientType.LINEAR, [0x000000,0xffffff], [1,1], [0,255], mtx ); drawRect( 0, 0, stage.stageWidth, stage.stageHeight ); endFill(); } // Draw the Shape inside some BitmapData. var bData:BitmapData = new BitmapData( stage.stageWidth, stage.stageHeight, false, 0x000000 ); bData.draw( shp ); // Create a Bitmap to display the BitmapData, and add it to the stage. var bmp:Bitmap = new Bitmap( bData ); addChild( bmp ); // For testing purposes: Set up a mouse click listener. When the user clicks, tween to new colors. stage.addEventListener( MouseEvent.CLICK, onClick ); function onClick( e:MouseEvent ) :void { // Choose two colors at random var c1:int = 0xffffff * Math.random(); var c2:int = 0xffffff * Math.random(); trace("Now tweening to:", c1.toString(16), c2.toString(16) ); colorChange( c1, c2 ); } // This function supports tweening the gradient to ANY TWO COLORS. // If you just want to tint a gradient, then you can use less scary code, // but you didn't specify that ;) function colorChange( c1:uint, c2:uint ) :void { // Split the incoming color uint's into RGB values, ranging from 0..255 var o1:Object = { r: (c1 &amp; 0xff0000) &gt;&gt; 16, g: (c1 &amp; 0x00ff00) &gt;&gt; 8, b: c1 &amp; 0x0000ff }; var o2:Object = { r: (c2 &amp; 0xff0000) &gt;&gt; 16, g: (c2 &amp; 0x00ff00) &gt;&gt; 8, b: c2 &amp; 0x0000ff }; // Using these values, create our sweet ColorTransform. // This will "map" the black and white pixels to the desired colors. // The aforementioned blog post explains this math: var ct:ColorTransform = new ColorTransform( (o2.r-o1.r)/255.0, (o2.g-o1.g)/255.0, (o2.b-o1.b)/255.0, 1, o1.r, o1.g, o1.b, 0 ); // Start the tween. Tweener.addTween( bmp, {_colorTransform:ct, time:1.0, transition:"easeOutQuad"} ); } // Hope this helps... </code></pre>
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    1. POCreating the most efficient fullscreen color-shifting gradient
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    1. COThis is a really cool technique for creating a gradient transition. Thanks for posting it. For those TweenLite users out there you can make zkarcher's code work by using the changes I added to my original question. Unfortunately, as evidenced by the dual examples, this technique offers almost exactly the same performance as my original timeline-animation method.
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    2. COAh, that's a bummer that my technique didn't increase the frame rate. Sorry... I tried my best!
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