In my work I have to render pieces of furniture placed on a white background. I’m achieving not so bad results; however, the shadow that the furniture casts on the ground is too dark:
another way would be to add a tiny amount of emission to the floor (with the emission color set the same as the base color)… not enough to light the bottom of the couch, but enough to tone down the shadow. if you’re on 4.x then you can even tell the floor light to not light up the couch regardless of brightness.
I thought about adding an emissive shader to the floor, but it didn’t occur to me that I could exclude the couch geometry with light linking. Thanks for the tip!