on your Mac, double-click a photo, then click Edit in the toolbar.Click Adjust in the toolbar.
In the Adjust pane, click the arrow 
Hue: Adjusts the hue of the selected color. For example, you might change a green hue to blue.
Saturation: Increases or decreases the intensity of the selected color. For example, by desaturating a vivid pink, you might change it to a light or nearly gray pink.
Luminance: Adjusts the luminance (the appearance of brightness or the amount of light reflected from a surface) of the selected color.
Range: Adjusts the range of colors that change based on your color selection. By changing the range you can increase or decrease how much similar colors are affected in the photo. For example, by increasing the range of a selected blue you might change all the blues shown in a sky, or by decreasing the range, limit the change to a specific blue object.