An example to make it clear:
A graduation photo with a white background, replaced with a red background identity photo, with Acoustic Studio is able to do. That is to say, Acoustic Photography can be monochrome background keying, if the background is a complex landscape photo, Acoustic Photography can not do. Acoustic Studio can use the "chroma key" to do static and dynamic keying of photos or videos, the original photo or video for the blue background keying the best results. The upper picture into the lower picture is the acoustic shadow to do, the lower picture into the upper picture, acoustic shadow can not do.
As shown: