Global Saturation Adjustments
In order to work non-destructively, it’s best to create a new Hue/Saturation Adjustment Layer rather than adjusting from the menu bar.
By default, the Hue/Saturation dialogue box will change ALL of the Colors in an image when the sliders are adjusted. But this can be changed!
Local Saturation Adjustments
To do so, go the the “Master” drop down menu. You will see many other Colors, which can be selected and adjusted individually.
This method will select, again, ALL of that specific color found in the image. But what can you do if you only want a certain shade of green to change? You can use the Eyedropper Tool! We use it by pressing the icon on the left. Once your cursor turns into an Eyedropper, you can click on one point in the image and it will target just that exact color. You can also click and drag the grey slider that appears between the two colored bars.
Create a new Hue/Saturation layer and check the “Colorize” button. This will change the entire image to the same Color! This is handy if you’d like to change, for example, a red shirt to a green shirt. There isn’t much Variation in the Color, however. If you’re looking for some more Variation you can turn down the Opacity of the layer so that some of the original image comes through.
Painting on an image
If you’re looking to add some Color in a unique design, you can do that too! We create a new blank layer and then use the Brush Tool to paint some bright pink onto the image. At this point, the pink looks very obviously Photoshopped. To play with how the color blends into the photo, try using different blending modes. The “Color” blending mode yields a beautiful result, as does “Hue” and “Overlay.”