The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 93

Figure 2.16
Changing the blend mode of this texture layer to Overlay attaches it to the gray pa-
per but also to the flowers and the table top ( Figure 2.17 ). There's no need to
worry about that at this stage, but if you don't want to use the color in the texture,
then you can desaturate it.