When a photograph is taken in sun, the whole photograph becomes slightly orange in color. Specially the skin tones become too orange. The photographs are taken from simple mobile phone high megapixel camera. So, when I try to white balance during post-processing, correction made on skin tones leads to slight tint in other objects. I would like to explain this with an example.
Say I have a photograph having a person standing in front of some grayish stone, clicked around 3 pm. In the photograph, initially, the person looks too much orange in color, while the stone is neutral gray. I am telling you this because I check RGB values with eye-dropper tool. Now, to decrease orange in the skin tones, I drop the red curve slightly more than I drop green at appropriate luminous levels respectively. Now the orange cast is gone, but when I inspect RGB values of stone, it is more towards blue, which is obvious. So, I try to adjust the color of the stone to make it neutral back again. But, the image and consequently the person becomes orange in color more or less as he looked initially.
So, is it not possible to white balance a photograph in this scenario, with the help of a single curve adjustment layer, without using masking? This raises other questions: does our eyes (more precisely brain) white balance different objects in a single scene separately? In that case, it should not be possible without masking, I guess. Or is my camera faulty?