User guide

KeylightThe Foundry

ADVANCED KEYING

Status

to highlight any areas that are not pure foreground or background. Grey

pixels do not mean the key is poor - the final composite may be fine.

You may occasionally see other colours in the Status. Figure 32 shows

black, white, grey and green pixels.

The green pixels are a warning. They show you the parts of the Screen

Matte that have changed through processing the matte (clipped, softened

or eroded). These areas have had the correct amount of spill removed, but

the alpha has subsequently changed and the composite may no longer look

right. This can be corrected using the Replace Colour to put back colour in

these areas. Figure 33 is an extreme example to illustrate the point. The

Replace Colour has been set to pure red and you can see that this mirrors

the green pixels in the Status. Similarly you may see blue pixels in the

Status.

These represent processed pixels in the Inside Matte that affect the despill

of the foreground. The Replace Colour in the Inside PPG will be used to

modify these pixels. Another extreme example is shown in Figure 35. The

Replace Colour is set to pure yellow and the Replace Method is Hard Colour.

Figure 32. Status showing processing of the

Screen Matte.

Figure 33. Result showing Screen Matte

Replace Colour.

Figure 34. Status showing how the Inside

Mask will affect the foreground.

Figure 35. Final Result showing the Inside

Mask Replace Colour.