Veil Settings; Shadow Level And Shadow Threshold; Matte Process/Screen Correction - Blackmagicdesign Ultimatte 12 Operation Manual

Veil Settings

At this point while you are optimizing your matte, you may notice a fine white haze over your
final composited image. The haze can sometimes appear as a general haze, or localized in
patches corresponding to the screen area of the foreground source.
The white haze is known as 'veil' and you can minimize it by adjusting the veil settings.
Master Veil
Increase or decrease to remove neutral colored veil over your program or fill output.
Red, Green, and Blue Veil
Adjust these controls respectively when you see a colored haze over the
program output.
TIP Switch your monitor view between the fill output and program out to determine
the best veil settings.
NOTE Veiling can become more pronounced over the course of the day as your blue
or green floor gets dirtier or dustier. We recommend wearing slippers when not
shooting if crew and talent are walking on the blue or green screen. Repainting of the
screen may become necessary to remove permanent dirt and marks.

Shadow Level and Shadow Threshold

If you want your shadows in the foreground source to be more or less pronounced in your final
composite, increase or decrease the shadow level. The shadow threshold setting is used to
help separate unwanted dark screen areas from shadows.

Matte Process/Screen Correction

Depending on the conditions of your green screen, the backing color may not be consistent
which can reduce the effectiveness of the matte. If you are seeing noise or artifacts in your
matte that you can't solve using the general matte settings, and you have access to an image
of just the green screen without foreground objects, then you can use screen correction to
improve the matte.
To set screen correction:
1 Remove all the foreground objects in your scene so only the green screen is visible.
2 Tap the 'screen capture' button so Ultimatte can store a snapshot of the green screen.
3 Now replace all the foreground objects in your scene.
4 Tap the 'screen correct' button.
You should now see a general improvement in your matte and final composite.
NOTE Screen correction only works with static camera shots. This feature is the best
choice for improving areas in the backing screen, and clean up controls can be used as
a last resort if areas still need improvement.
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