2. How to use colour grading:
In the Colour Grading section, you’ll see various attributes you can edit, including three wheels marked Midtones, Shadows, and Highlights.
Midtones, Shadows and Highlights refer to your image’s Luminance values. Luminance is the light, medium or dark parts of your photo. In essence, each of these wheels affects the colour balance of the relevant luminous sections of your photos.
You will see smaller open grey circles within each Colour Wheel. These circles are positioned in the white centre of each colour wheel before any adjustments are made. You can pull these circles in different directions of the wheel, which will affect the colour balance within that range of luminance values.
For example, pushing the cursor in the Midtone circle towards the blue hues injects more blue into the middle/grey values of the photo. Similarly, pushing the Highlights towards an orange or red tone will add a rose-y tint to the bright values. To refine only the Saturation, drag the circle within the wheel. To refine only the Hue, drag the circle on the edge of the colour wheel. If you want to remove your edits, position the cursor over the name of the colour wheel (the name will have to “Reset xxx”) and click.