Have you ever shot in a situation with two light sources ? A classic example consists of shooting indoors with artificial lamp light and natural light coming from the windows. Unfortunately your camera can be tunes to only one white balance, so a part of the image will be off color. Here is a quick tip on how this can be tackled using the brush tool in Adobe Photoshop Lightroom 6.
In the video you will see an image that starts looking like this: