My old Adobe friend Sylvain Paris & some university collaborators have proposed a nice-looking approach to fixing mixed lighting.

“Unfortunately,” they write, “many scenes contain multiple light sources such as an indoor scene with a window, or when a flash is used in a tungsten-lit room.” In the proposed solution, “Users scribble on a few regions that should have the same color, indicate one or more regions of neutral color (i.e., white or gray), and select regions where the current color looks correct.” Check out the project PDF for more details.

Source image:

User scribbles:

Output image

[Via John Schlag]