Join Richard Harrington for an in-depth discussion in this video Smoothing keyframe transitions with handles, part of Fixing Video Exposure Problems in Premiere Pro CC.
With keyframes, there's a concept called easing. Think of it this way. If you were watching a race with a car taking off from the starting line? It wouldn't immediately go from zero to 300 miles an hour. There'd be a ramping up. Just like as it crossed the finish line, it would also need to decelerate. And as it rounded a curve it would make a gentle transition from one point to the next and often change it's speed. This is ease. And it's essentially the natural modification of a key frame to create a smoother transition.
The computer will do just about all of this for you as long as you tell it. Let's start by selecting our initial key frames here. And I'll go to those first values. They're all active. And with a right click, I could choose to ease out of those key frames. You'll see that it creates a smooth curve. And in fact, if you want you can even gab that handle yourself, and play with the curve value. Although, I'll use the default. At the end here, I'm going to select those and choose to ease in.
And again, it creates a nice ramp. For these middle ones, they're inherently okay. But instead of linear, I'm going to select a more natural auto bezier which creates a natural curve and you see here a much more gentle transition between the different states. We have a more natural movement. This is going to make it easier to smooth out those transitions. Alright, let's take a look at that, playing back in real time. And it's going to smoothly transition to one value and then back to the other.
Once more. I really like how this is working. We have a nice gentle transition between the two exposure states. Alright that looks good. By using keyframes it's more easy to fix situations where you have either a moving camera. Or a moving subject or perhaps a lighting source that's changing. And even if the lighting source is stationary, something passing in front of the light, maybe a cloud, could change the available light. So there are often environmental things that you need to deal with.
Taking advantage of key-framing lets you get just the right exposure or color settings for that particular frame. And then by taking advantage of some smoothing, or ease, you could simplify the transition between the two points and create a smoother, more natural look as you move through the shot.
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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