011 Unpremultiply workflow examples

- [Voiceover] Hi, this is Steve Wright.…Welcome you to this week's Nuke Nuggets:…Premultiply and unpremultiply workflows.…This video has no exercise files.…It's a watch-only demo.…We covered how premultiply and unpremultiply work…in last week's video.…This week, we'll take a look at proper workflows,…when and how to use premultiply and unpremultiply…in your composites.…It turns out it's pervasive throughout Nuke.…Now, before we begin, there are two very important rules…you need to know.…

Rule number one,…colorspace conversions and color corrections…must be performed on the unpremultiplied image.…Rule number two, filtering operations must be performed…on the premultiplied image.…Filtering operations are like doing a blur…or, if you're doing any kind of an image transformation,…the pixels are filtered,…so it applies to premultiplied images.…So let's take a look at the colorspace conversion issue…because that affects the read node.…

I've set up the proper workflow for a read node right here.…Now, what I did was I set the read node to be raw data,…