Blending two images by using GPUImage 2

gistfile1.txt

		let alphaBlend = AlphaBlend()
		alphaBlend.mix = 0.5

		let input1 = PictureInput(image: UIImage.init(named: "IMAGE1.jpg")!)
		let input2 = PictureInput(image: UIImage.init(named: "IMAGE2.jpg")!)
		let output = PictureOutput()
		output.imageAvailableCallback = {image in
			UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
		}
		input1 --> alphaBlend
		input2 --> alphaBlend --> output

		input1.processImage(synchronously: true)
		input2.processImage(synchronously: true)