Apple Shake 3.5 Guia do Utilizador descarregar pdf (Página 16)

Set Roto-Screen Correction

QUICK START

Video Correction

Alternatively, by clicking on the Foreground pop-up menu above the

Foreground thumbnail icon, the view can be toggled between Video Corrected

Foreground and Foreground. You may need to zoom into an area to see the

difference.

Set Roto-Screen Correction Controls (if necessary) (suggested: Screen Overlay view)

Ultimatte Corp introduced a feature in 1990 called Screen Correction. Screen Correction compensates for

anomalies in the backing area such as uneven lighting, smudges, seams, variation in the backing color, blue

(green) set pieces, and unwanted shadows cast by set pieces, boom arms, etc. This technique assumes that

an exact copy of the problematic blue (green) screen element with the subject matter omitted, usually called a

"Clean Plate", is supplied.

Although this technique gives great results by differentiating between foreground elements and backing

ﬂaws, we have found that most users have not been supplied with the necessary reference materials.

Therefore, we have devised a technique in which we will attempt to build a synthetic Clean Plate. By using the

Roto-Screen Correction process, a user will now be able to use Screen Correction technology as well as have

separate shadow controls allowing the density of the shadow to be altered without affecting the foreground

subject.

To achieve the best results, a reference Clean Plate should be used as an input to AdvantEdge as well as

allowing the software to generate a synthetic plate. In this way, the reference plate that is used as an input

will allow for the best shadow separation, while the synthetic plate will be used to reduce such artifacts as ﬁlm

grain or video noise (which will rarely be accurately reproduced when the clean plate is shot during the time of

principal photography).

Switch the view to Overlay by clicking on the Overlay thumbnail icon.

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Apple Shake 3.5 Guia do Utilizador Página 16