is this correct about alpha blending: "Alpha blending or alpha compositing is a technique that is used to combine two images, one image on top of the other image, with the ability to control the opacity (more transparent or less transparent) of the top image. The final image is referred to as a “composed image". Alpha is referred to as transparency or opacity. For example, we have two images, one of a tree and one of a house. We can use alpha blending to combine two images, and the tree appears to be in front of the house. We can control the opacity of the tree to make it more or less transparent, and thus we can see more or less of the house behind the tree. 
It has lots of applications such as overlaying text or other animations on an image which has applications in augmented reality devices (e.g., presenting the energy bar of the player), rendering shadows and reflections in video games, using visual effects to combine computer-generated imagery (CGI) with live-action footage (a superhero is flying in the air and alpha blending is used to combine the actor's footage with the CGI background). " Do not include the following keywords: device, background, energy, house
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