White Balance And The Mostly Ignored Tint Slider
Setting the white balance of an image is more than just if it needs to be warmed up or cooled down. The image may also have a green to magenta tint to it. Watch a Youtube video of someone processing an image. If it’s not a moody night image then the presenter will almost invariably say the image needs to be warmed up a bit. This is especially true if the image has a human in it. For some reason cameras seem to prefer a slight cyan coloration to skin.
Changing the white balance of an image (in raw format please) is straight forward. Find the white balance eyedropper in your image editing weapon of choice and click on an area that should be a neutral gray. The image is evaluated and a change to the Temperature/Kelvin slider is adjusted to remove an incorrect color balance. You can also just pick from the drop down to tell it what kind of balance you want. Daylight, Tungsten or a number of other choiced based on the camera you used.
While most adjustments seemed to be made to the color temperature of an image you also need to be aware of the tint of the image. And what you say is the tint? The tint is for adjusting the green to magenta color cast of the image.
You probably don’t pay a lot of attention to the Tint Slider but it does change when white balance is adjusted and anytime you might want to reduce a green or purple cast to you image. One example would be if someone was sitting next to a large green plant there may be a green cast on their face.
The following image was shot off a bridge where the light was rather interesting. It was shot mid-morning at 10:24 am so the sun was getting pretty high in the sky. Not a golden hour shot at all. I have my Fujifilm X-T2 camera set to auto white balance so it was interesting to see what white balance it used.
Here is the white balance as dictated by the camera.
You will notice that the camera gave this a tint of 14.7. The scale for tint is -50 to +50 with the minus side going towards green and the plus side going towards magenta.
And with the white balance set to daylight.
You can see that there is a purplish color cast with the as shot balance and you will notice that tint is 14.7 which is moving the tint towards the magenta. When we adjust to daylight the tint goes down to 2.1 and we don’t have the shadows being rather purple.
There is nothing wrong with adjusting the white balance Kelvin slider to warm or cool your images to what pleases your eye, just remember you can also adjust the tint for the same reasons.