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Tweens special EaselJS-related properties for things like saturation, contrast, tint, colorize, brightness, exposure, and hue which leverage EaselJS's ColorFilter and ColorMatrixFilter (seehttp://www.createjs.com/#!/EaselJS for more information about EaselJS). Of course you don't need the plugin to tween normal numeric properties of EaselJS objects (like x and y), but some filters or effects require special manipulation which is what EaselPlugin is for. Currently it only handles special properties related to ColorFilter and ColorMatrixFilter, and it can tween the "frame" property of a MovieClip.

GreenSock's EaselPlugin exposes convenient properties that aren't a part of EaselJS's API like "tint", "tintAmount", "exposure", and "brightness" for ColorFilter, as well as"saturation", "hue", "contrast", "colorize", and "colorizeAmount" for ColorMatrixFilter. Simply wrap the values that you'd like to tween in an "easel" object. Here are some examples:

//setup stage and create a Shape into which we'll draw a circle later...
var canvas = document.getElementById('myCanvas'),
stage = new createjs.Stage(canvas),
circle = new createjs.Shape(),
g = circle.graphics;
//draw a red circle in the Shape
g.beginFill(createjs.Graphics.getRGB(255, 0, 0));
g.drawCircle(0, 0, 100);
//in order for the ColorFilter to work, we must cache() the circle
circle.cache(-100, -100, 200, 200);
//place the circle at 200,200
circle.x = 200;
circle.y = 200;
//add the circle to the stage
//setup a "tick" event listener so that the EaselJS stage gets updated on every frame/tick
TweenLite.ticker.addEventListener("tick", stage.update, stage);
//tween the tint of the circle to green and scale it to half-size
TweenLite.to(circle, 2, {scaleX:.5, scaleY:.5, easel:{tint:0x00FF00}});
//tween to a different tint that is only 50% (mixing with half of the original color) and animate the scale, position, and rotation simultaneously.
TweenLite.to(circle, 3, {scaleX:1.5, scaleY:0.8, x:250, y:150, rotation:180, easel:{tint:"#0000FF", tintAmount:0.5}, delay:3, ease:Elastic.easeOut});
//then animate the saturation down to 0
TweenLite.to(circle, 2, {easel:{saturation:0}, delay:6});

You can also tween any individual properties of the ColorFilter object like this:

TweenLite.to(circle, 3, {easel:{colorFilter:{redMultiplier:0.5, blueMultiplier:0.8, greenOffset:100}}});

Or you can tween things like the "exposure" of an image which is a value from 0-2 where 1 is normal exposure, 2 is completely overexposed (white) and 0 is completely underexposed (black). Or define a "brightness" value which uses the same concept: a value from 0-2. These effects can be very useful for images in particular.

Note: a common mistake is to forget to wrap EaselJS-related properties in an easel object which is essential for specifying your intent. You also must load the EaselJS's ColorFilter and/or ColorMatrixFilter JavaScript files to enable the filters to actually work.

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