No, the real definition of rendering means to apply shadow and texture or it's used in reference to creating models with 3D programs. What you're doing describes nothing of the sort and is not valid anywhere. You just assumed that's what it meant because you "saw it on the internetz" and followed other people blatantly and blindly without actually giving it a second thought. In reality, you're just feeding the masses stolen art with an erased backgorund which serves no purpose at all.
It's still considered a violation of copyright as the original picture does not belong to her... Just because it's on the internet doesn't mean you can just use someone else's art whenever it suits you....
Ohh, so adding flashy filters to make pointless sig banners because that's ever so useful