To access the Hue/Saturation tool, select Layers>New Adjustment Layer> Hue/Saturation...

When the Hue/Saturation dialog is opened, it defaults to editing all of the colors in the image. Adjusting the Saturation slider increases or decreases the saturation for every color in the image. Adjusting the Hue slider shifts the color of every color in the image; usually, this is not the desired result. Adjustments to Hue shifts the adjusted colors around the color wheel, in the example shown, blues are shifted to purple, reds to yellow, yellows to green, and so on. The color bars at the bottom of the dialog display these color shifts.

Colors before Hue/Sat adjustment

Colors after Hue/Sat adjustment

Colors after Hue/Sat adjustment

The Hue/Saturation tool becomes much more powerful when it is localized to affect only a narrow range of colors. Change the Edit option from "Master" to one listed colors. Now a range is displayed between the color bars.

To more precisely select a specific color, move the mouse pointer over the image (the pointer will change to the eyedropper), use the eyedropper to select a color from the image. The Color range will be adjusted to select this color.

Select an edit color to define the color range to edit

Select an edit color to define the color range to edit

With a specific color range set, the Hue/Saturation tool becomes a much more effective color editor. Adjustments to HSL will only affect the specified color range.

With a specific color range set, the Hue/Saturation tool becomes a much more effective color editor. Adjustments to HSL will only affect the specified color range.

Select a color from the image to set the color range to edit more precisely

Select a color from the image to set the color range to edit more precisely

The Hue/Saturation tool is very powerful for making subtle changes to individual colors, by changing the hue, saturation, or lightness of the color. For example, you can "make the orange grasses redder" (as above), or "make the cyan sky bluer", or "make the blue water more saturated", and so on. It is common to create many different Hue/Saturation adjustment layers on a single image that each make small color adjustments.

The Hue/Saturation tool can easily be overused. Small changes to hue, saturation, or lightness can be fairly dramatic. Be subtle.

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