The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 113

Figure 2.38
Note
When cloning away areas of the background, you don't have to create a perfectly
cloned area. Having uneven areas, as you can see in Figure 2.38 , makes for a
more interesting background when the new wall texture is added in, much like the
lighting in the blend mode technique.
6. Keep the cutout selection visible and add a Hue/Saturation adjustment layer ( Fig-
ure 2.39 ) . Set Saturation to -100 to completely desaturate the back wall, which
gives us our gray background ( Figure 2.40 ) .