Join Richard Harrington for an in-depth discussion in this video The Luma Curve effect, part of Fixing Video Exposure Problems in Premiere Pro CC.
On the subject of Luma, you'll also find a Luma curve which allows you to make a gradual adjustment to the luminosity in the image. Remember, a curve can have three control points, or even 16 control points. But generally it makes a more natural adjustment. Let's select the image here. And you'll see that what we want to do is knock the exposure down just a little bit. To do that, I'll select this third shot and apply the Luma Curve. Right now, there's two points added and what we need to do is make a third.
Typically, what happens is, is people will click on the curve here, and if we pull down on the middle, you see the mid towns have been knocked down a bit. If we lift up, the mid towns go up. Let's reset that. What I'm going to do is add two more control points. One for the shadows. And one for the highlights. And I'm going to pull the highlights down while lifting the shadows up a little bit. And you'll see there that some of the darker areas are brighter, while the brighter areas are darker.
And while that sounds simplistic, it was the fix that this shot needed. Now, what you need to be careful of is if you pull too far you might see some posterization or flattening of the colors. So, be gentle as you make those adjustments and use more control points if necessary. Also, at the bottom here, you can lift the black point overall or lower the brightest white. All in all, the curves adjustment is tremendously useful as a way to adjust the luminosity within the image.
If you need to go further, you can take a look at secondary adjustments. And actually isolate the adjustment using a mask. This allows you to click and set the area you want to effect. And then, using your tolerance controls here, you can refine things. So, I could affect a broader luminosity range, as well as a saturation range. And you see how it's limiting that effect to only parts of the image.
By softening that a bit, we can better control things. And I'll switch that back from showing the mask. And so now, any adjustments I make are only effecting the bright sky there and the front of the trolley surface. This makes it a bit easier to be more aggressive since you're isolating the adjustment in the scene. Secondaries are a great way to further refine the primary adjustment and essentially allow you to mask out the results based on a selection criteria.
In this case, I used saturation, hue, and luma to generate a useful mask, and then I softened it up substantially so the results were applied more gently to the scene. You'll see there that that did a nice job of knocking down some of the brighter areas of the shot and gave me the desired end result.
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- Using the Waveform Monitor
- Toggling effects on and off
- Working with Auto Contrast, Auto Levels, and Auto Color effects
- Using color correction effects to fix exposure and tone
- Controlling noise and grain
- Keyframing effects
- Sending projects to After Effects with Dynamic Link
- Extracting backgrounds with the Roto Brush tool
- Adding a vignette to footage
- Working with raw video
- Legalizing video for broadcast