Saturation: Adjusts the photo’s overall color intensity.
Contrast: Adjusts the color contrast and separation between similar colors in the photo.
Cast: Adjusts and corrects for color cast in the photo.
You can fine-tune the intensity of tones and grey areas, and change a photo’s grain.
Double-click a photo, then click Edit in the toolbar.
Click Adjust in the toolbar, click the disclosure triangle next to Black & White, then click the disclosure triangle next to Options.
Drag any of the sliders to change the photo’s look: