Adobe Lightroom – Introduction to the Adjustment Brush
The Adjustment Brush, located in the Tool Strip under the Histogram, allows you to make adjustments to exposure, brightness, contrast, saturation, clarity, sharpness and color. You can choose any configuration of these settings to apply to selective areas of your photo, and you can even edit those settings on the fly while you work.
You can apply multiple brush strokes with different settings. For example, you might use a combination of reduced exposure and saturation to paint on the background, while you also apply a few strokes of increased brightness and sharpness to a subjects eyes. Be as creative as you need to be.
Let’s walk through an example to demonstrate the basics of how this tool works. The best way to begin to use the Adjustment Brush is after you’ve made your basic global adjustments, mainly white balance and exposure, since these global adjustments will affect the local adjustments you will make later. So perform the adjustments in the Basic panel before picking up the brush.
Here’s a photo that has had the basic global adjustments applied. It is OK, but I’d really like to see if I can make the subject pop a little more from the background. It has a shallow depth of field, and that is a good way to separate a subject from the background, but we can also enhance that separation by adjusting saturation, brightness, contrast and sharpness, which is where the Adjustment Brush comes in very handy.
Step 1.
Select the Adjustment Brush.
If you are already in the Develop module you can simply click on the Brush icon in the Tool Strip. An easier alternative is to just press K. You can press K from anywhere in Lightroom and it will bring you to the Develop module and activate the Adjustment Brush.
Once the Brush is activated you will see its options expand in the panel beneath it. Like the Graduated Filter, the Adjustment Brush also has two modes — Buttons and Sliders — that you can toggle between by clicking the Show Effect button. I usually prefer to work with the sliders because it just feels more intuitive to me.
Step 2.
Configure the types of adjustments you want to apply.
The first thing I want to do with this photo is make those frogs eyes really pop (as if they are not already popping right out of his head). To that end I want to increase the sharpness and bump up the brightness and saturation.
Sometimes it is easier to boost each setting higher than you really want to apply so the effect of the adjustment is easier to see while you are working. Then once you have painted over the chosen area, you can dial back any of the settings (or even add new ones) as needed.
TIP: Hold the Spacebar and click to zoom in/out when the Brush is active. While zoomed in, click and hold the Spacebar to pan around the image.
Step 3.
Configure the characteristics of the brush itself.
Just like when using the brush tool in Photoshop you can control the size of the brush and the softness or feather of the brush. If at first you don’t see all the brush settings sliders click the black arrow to expand the Brush settings panel.
The four settings you can control are Size, Feather, Flow and Density. Size and Feather are the most familiar, where Size determines the diameter of the brush cursor and Feather determines how far out to fade the effect from the edge of the brush. When you look at the brush cursor, you see a crosshair at the center of a larger circle. The area inside of this circle gets the full effect of the brush settings. Depending upon the Feather setting you will see a second larger circle that defines how far out from the edge to fade the effect.
NOTE: When Feather is set to 0 you won’t see the outer circle because there is no fading of the edge.
Flow and Density control how much of the effect is applied with each brush stroke. With Flow and Density both set to 100, you can apply the full amount of the effect with every stroke. With Flow set to 50 and Density set to 100, you can apply half the full amount of the effect with every stroke. So, by reducing the Flow setting you can build up the effect with multiple strokes. This is very helpful for making gradual levels of adjustment.
Another way to put it is that the Density controls the maximum amount of the effect you are able to apply with the brush and the flow controls how much of the effect can be applied in a single brush stroke. To help illustrate how this works, I applied 4 different brush strokes (just a single click of the mouse in each case) with a range of brush settings to a new image that is 50% gray. The only constants were the effect, which was a +4 Exposure, and a brush Size of 15.
The first brush stroke shows the full effect of the Exposure setting in a single click with a hard edge (Feather = 0) brush. The second stroke shows the difference of setting Feather to 100, which completely fades out the edge of the brush. In the third stroke Flow was reduced to 50, which applied half the amount of the effect in a single click. In the fourth stroke I left Flow at 50 and reduced Density to 50, and now the single click resulted in a barely perceptible change. All of these strokes were made without ever changing the effect setting from Exposure = +4, so you can see that just adjusting the brush settings can have a profound effect on your adjustment. I’d encourage you to create a new document in Photoshop and fill it with 50% gray, then bring it into Lightroom and experiment with the various brush settings to get a feel for how they work.
Moving back to the frog eyes, I want to use a hard edged brush, just large enough to fit inside the eye, and I’ll leave Flow and Density set to 100 to apply the full effect in one stroke.
Step 4.
Click and hold the mouse on the photo to “paint” the effect.
When you release the mouse, you will see a gray circle with a black dot has appeared at the point where you first clicked. This is called the adjustment pin, and it will be associated with all the effect settings you applied at this time. You can continue to paint these settings anywhere else in the photo, and so I will go ahead and paint over both eyes.
Although you can’t see it by default, while you are painting you are creating a mask over the areas you are brushing. If you hover the cursor over the adjustment pin you will see the mask become visible, which is great for seeing where you have painted. You can also press the O key to toggle the mask visible/invisible while you are painting. This way you can really see what you are doing.
You can also change the color of the mask by holding the Shift key and pressing O to cycle through the other colors (red, green, white and gray).
If you do paint over an area that you didn’t want to be affected, you can click on Erase in the Brush panel and change the brush into an eraser (notice the inner circle of the brush changes to a minus sign). You can also just hold the Alt/Option key to change the brush to the eraser on the fly. Release the Alt/Option key to go back to painting.
When you are done painting just click the Close button at the bottom of the Brush panel to exit the brush.