User guide

KeylightThe Foundry
ADVANCED KEYING
30
Cropping
Note If you do use an externally generated mask, it is added to any inside/outside mask
generated within Keylight.
Cropping
Figure 58 shows a lighting rig on the left side of the green screen. You can
use the cropping controls on the Cropping PPG to quickly remove objects
like this. View the result, switch on Blank Cropped Region and simply
increase the Crop Left parameter until the rig is removed. If you prefer you
can use the on-screen cropping tools to do the same. You will see the image
displayed in Figure 59.
The outside mask forces that part of the image to be in the background thus
keying it out.
Keylight requires access to source pixels that lie off the edge of the source
image. The cropping controls provide access to all the controls required for
specifying how pixels are treated at these edges and where they appear.
The built-in crop controls are also useful for removing unwanted lighting
rigs.
Display Cropped Source - switch this on to show the effect of the cropping
on the source image.
Blank Cropped Region - switch on to cut away the cropped region. This is a
good way to remove lighting rigs.
Left, Right, Top, Bottom - use these controls to set the crop positions. Lines
will be overlaid in the display enabling you to set the various positions by
eye.
Note The position of the crop lines can be changed by clicking and dragging them directly
on the screen.
Figure 58. Lighting rig on the left. Figure 59. Lighting rig removed with cropping
tools.