User guide

KeylightThe Foundry

BASIC KEYING

Screen Colour

Basic Keying

The following section describes the parameters you need to do basic keying.

This will give you enough to tackle most simple keys. A discussion of

advanced parameters to fine tune keys and tackle complex keys can be

found in the next chapter.

Screen Colour

The Screen Colour is probably the most important parameter and you should

always pick the screen colour before doing anything else. It should be set to

the colour of the green or blue curtain behind the foreground object. From

the Keylight PPG pick the screen colour directly from the window. Setting

the Screen Colour will create a matte - the Screen Matte - and despill the

foreground. In some cases this is enough to get a decent key. For more

information on Screen Colour see page 16.

Figure 8 shows a well lit blue screen behind an actor.

Figure 8. Blue Screen.

You should note that repeatedly picking the Screen Colour will override any

previous selections. It will not add to previous selections and key more of

the image with each click. To key more of the image, if the foreground is

showing through the background, you need to use the Screen Strength

parameter.

Render

After picking the Screen Colour it’s useful to be able to view the key in

different ways. You can do this using the Render drop-down menu, shown

here in

Figure 9 on page 13.