Getting the right colour cast in your images can be challenging. All light gives off a different colour temperature, depending on whether the source is natural, or from indoor lighting.
Your sensor picks up this emitted light, adding a colour cast to your image. Today, we are going to show you how to correct your white balance in Photoshop.
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Light is what makes an image possible. You may find that sometimes the image has a colour very similar to the scene you are capturing. Other times it is way off, making the image look much warmer or cooler than it actually is.
If you are having problems with the colour cast, you need to think about your white balance.
Light ranges from warm tones (yellows and oranges) to cool tones (blues) and every situation is different. To give you an example, the colour casts range from 1,700 K for a match flame and 10,000 K for a partly cloudy sky.
It is helpful to know the difference between the light sources you are using.
Tungsten lamps or Incandescent lamps are electric lights with a wire filament. These heat to such a high temperature that it glows with visible light. These are the bulbs found in our homes and range between 2500 and 2900 Kelvin.
Fluorescent lamps are low-pressure mercury-vapour gas-discharge lamps. They use fluorescence to produce visible light. These are what you would find in public buildings, such as schools and offices.
Quart lamps or Halogen lamps are incandescent lamps, consisting of a tungsten filament, sealed into a compact transparent envelope. These contain a mixture of an inert gas and a small amount of a halogen such as iodine or bromine. These are primarily used in constant studio lighting.
Sometimes, you can see the Kelvin colour temperature on the bulb’s packaging. This allows you to set the white balance correctly.
Why Is Light Balance Important
Light balance is what makes your scene believable. If you want a realistic photo, then pay attention to your blacks, whites and mid-tones.
These shifts in colour can create interesting effects. But this is something you want to add later to specific areas, not affecting the whole scene.
Setting your white balance in-camera is the best way to go. This ensures that your image is as close as it can be from the get-go, as it becomes tricker to solve during post-production.
Your camera has an inbuilt white balance setting which you can set as you wish. There are other options you can choose from, such as using a colour checker or grey card.
A colour checker is an expensive tool to help you get as close to a colour balanced image as possible. This tool opens up to show an array of colours. You should photograph these before a photography session.
This allows you to correct the images by copying the settings across all images using the same lighting setup.
Sometimes, you’ll find you want to tweak the colour temperature in post-processing. This is due to using a rapidly changing scene. And the Automatic White Balance on your camera hasn’t quite got it right.
It is always better to get it as close as you can in camera, but changing the colour cast in Photoshop is simple.
The best way to correct the light is using Curves. This is found in Image>Adjustments>Curves.
Setting the White Point
The curves dialog box will open. There will be a few boxes and settings, but right now, all we need to focus on are the eye droppers at the bottom of the pop-up.
On the far right, we have the highlights eyedropper, used to set the white point. Click on it to select it.
Your mouse should turn into an eyedropper. Find the whitest or most lit point in your image.
Setting the Grey Point
Next, click on the middle eyedropper icon. We use this for setting the grey point in the mid-tones of the image.
Find an area that has a medium amount of colour and light. In this image, I clicked on the pavement towards the middle of the image.
Setting the Black Point
Next, select the left eyedropper icon. This uses the shadows to set the black point in the image.
Find the darkest part of our image, preferably black, and click on it. Here, I selected the black area around the house to the left.
I selected this area as it has the most amount of shadow in the image.
You may find that this changes your image, and makes it much darker than you would prefer.
So, we use the curves to tweak the outcome.
Click and hold on to the small box in the bottom left corner of the curve box, and drag up. This way we add a little more light into the scene. By moving the box up vertically, we increase the exposure.
Increase until you feel happy with your image and press OK.
Here is our image, with a before and after. The changes are subtle, but as you will find, your images can still benefit from a small colour correction.
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