der.png': new etro.effect.Shader(),
        'stack.png': new etro.effect.Stack({
          effects: [
            new etro.effect.Brightness({ brightness: -100 }),
            new etro.effect.Contrast({ contrast: 0.5 })
          ]
        }),
        'transform/translate.png': new etro.effect.Transform({
          matrix: new etro.effect.Transform.Matrix().translate(-3, 5)
        }),
        'transform/scale.png': new etro.effect.Transform({
          matrix: new etro.effect.Transform.Matrix().scale(2, 2)