This is the base image, ideally it’s background would be transparent, not white:
Note the order of the parameters is not important.
Below is the “main” layer with transparent background. The legs aren’t on this layer. This is where the customization occurs. Usually the main layer overlays the base image:
The final image, always inherits the white background from the base image:
I’m trying to do something like this, but with the legs. The background image isn’t quite perfect, but you get the idea. We’ll allow customers to upload an actual image of their room:
And pick the perfect model and cover for thier sleeper:
However this seems to be the only way to view a sleeper with legs (and unwanted white background):