Balance. White Balance.

Mathematics of color balance

 Color balancing is sometimes performed on a three-component image (e.g., RGB) using a 3x3 matrix. This type of transformation is appropriate if the image were captured using the wrong white balance setting on a digital camera, or through a color filter.

“Autumn seemed to arrive suddenly that year. The morning of the first September was crisp and golden as an apple...”
― J.K. Rowling, Harry Potter and the Deathly Hallows