Color Swapping

Color Swapping is something similar to what I have done in previous posts however I've done some more  work with it.  One thing that I have noticed is that when painting over white or other light colors, the chosen colors do not come out the same but rather many hues lighter.  It's very difficult to understand which colors to use to achieve the exact look that I wanted.

Here is an example of what I started with.

After applying the color swapping technique I was able to change the couch to the color show below.  

Oddly enough, I sampled this color from a photo of some grapes and you will see as mentioned above, this was NOT the hue that I was going for.  

Not what you expected was it?

The one thing that I really appreciate about this technique is that it does not color over highlighting or reflections!