Keying with Keylight This section explains how to use the blue/green screen keyer, Keylight, in Nuke. Quick Key Consider this shot from The Saint, pictures courtesy of CFC and Paramount British Pictures Ltd. Blue screen.

Mattes There are 4 mattes in Keylight. 1.   Screen Matte 2.   Inside Mask 3.   Outside Mask 4.   Alpha (Composite Alpha) The Screen Matte is generated by the Keylight algorithm after the screen color has been picked.

Advanced Keying The following section describes how Keylight works under the hood as well as the parameters you need to fine tune keys and get the most out of Keylight. Basic parameters covered previously may also be covered here in more detail.

The Screen Replace instructs Keylight how to deal with such pixels. The Status displays which pixels use a replace method.

This is effectively how the Keylight developers got around the problem.

Keylight Keylight Inputs and Controls Step-by-Step Guides Video Tutorials Keylight is an industry-proven color difference keyer.

This renders the original source image with the Screen Matte generated in this Keylight node.

The mattes can be hand-drawn roto shapes or keyed mattes created by nodes like Keylight and Primatte. See Using EdgeExtend for more information. You can also output an edge mask to allow you to work on the edges separate from the rest of the image.

Switch to the 3D (V) view and rotate the view so you can see both the Keylight and the pillar geometry. 6.   Drag the y-axis handle (green) to move the light up above the pillar. 7.  

Keylight Produces industry-proven color difference keys. Primatte Produces keys by incrementally sampling single pixels, or a range of pixels. Ultimatte Produces AdvantEdge technology color difference keys.

Having applied Keylight and picked the screen color, you have good edges to your matte but the background is showing through the foreground. You could fix this by tweaking the Clip White, but in doing so it ruins your edges.

. • Keying with Keylight teaches you to use the keyer tool Keylight in Nuke. • Keying with Ultimatte shows you to use the Ultimatte keyer in Nuke. • Using RotoPaint shows how to use Nuke’s RotoPaint node. • Tracking and Stabilizing shows how to generate

Add a Roto node to the node tree and use the Bezier tool in the Viewer to create the matte.You don't need this step if you're using the image's alpha channel or a keyed matte from nodes such as Keylight or Ultimatte.

Connect the mask to the OutM input of Keylight and switch the parameter OutM Component to Alpha. The outside mask forces that part of the image to be in the background, thus keying out the rig.

Tuning Keylight creates the screen matte after the screen color has been picked. You can make fine adjustments to this matte using the Gain controls.

The first keyer we will try here is Keylight, so Keyer > Keylight. Foundry writes Keylight and, in fact, it is available in other compositing packages like After Effects, the functionality is the same.

The first keyer we will try here is Keylight, so Keyer > Keylight. Foundry writes Keylight and, in fact, it is available in other compositing packages like After Effects, the functionality is the same.

The first keyer we will try here is Keylight, so Keyer > Keylight. Foundry writes Keylight and, in fact, it is available in other compositing packages like After Effects, the functionality is the same.

The first keyer we will try here is Keylight, so Keyer > Keylight. Foundry writes Keylight and, in fact, it is available in other compositing packages like After Effects, the functionality is the same.

Note:  It is not currently possible to create a holdout mask using a key matte from another node, such as Keylight. 3.   Make sure you’re still on the same frame as you used to draw the Bezier shape.