From the course: VFX Keying: Master Course

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The nature of grain and noise

The nature of grain and noise - Nuke Tutorial

From the course: VFX Keying: Master Course

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The nature of grain and noise

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- [Host] There are important differences between keying a green screen versus a blue screen. One issue is how the grain structure impacts the key. So let's take a few minutes to first look at grain and noise in film and video. Unfortunately, the images I'm using here are proprietary, so I can't share them with you and they're not in the exercise files, but we can look at their grain structures together. So, let's start by taking a look at a 2K film scan. So I'm gonna hit play. I've cropped out a small region in each plate and scaled it up so we can study the grain structure closely. First, we'll take a look at the red channel. See I put a little letter down here so you can always tell which channel I'm in. So there's the amount of noise in the red channel. The green channel, and the blue channel. So we can see right away the film grain is much more intense in the blue channel. Let me stop the playback. It's not only more intense in amplitude, it's also larger in size. So we look at…

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