When taking portrait photos of newborns against a black or white background (fabric), when editing the digital pictures, how can I easily make the background look solid where you don't see color variations & wrinkles in the fabrics? I want it to look like they're floating in a way! I'm...

Hello I am new to this forum and I am sure I am much more of an amateur than the many talented professionals here. I prefer to shoot portraits and people scenes of travel photography. My Canon XTI Rebel Kit lens, the 18-55, broke (actually I have a theory that the security of a recent foreign country...