Apple Shake 3.5 Betriebsanweisung PDF herunterladen (Seite 34)

Roto-Screen Correction Controls

THE “MORE” CONTROLS

Video Correction

Left:

use the leftmost pixel from a 4-pixel array to restore the

correct color information.

Right:

use the rightmost pixel from a 4-pixel array to restore the

correct color information (may be common when an image

format "ﬂips" the image).

Average:

use an average of the 4 pixels to restore the correct color

information.

• Low Luminance Noise: Use this control to adjust the amount of correction that will mostly affect the

dark areas of the screen.

Warning: Advancing this control too far can have an adverse effect on the Roto-Screen Correction process, if

enabled. It may be necessary to further reﬁne the Roto-Screen Correction Controls.

Roto-Screen Correction Controls for uneven blue (green) screens and to allow shadow separation • only

available when Matte Correction is ENABLED

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 is supplied as a

reference (clean plate).

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

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

known as "clean plate".

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 a reference plate is shot during the time of

principal photography).

Choose Roto-Screen Correction from the Slider Controls pop-up menu.

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Apple Shake 3.5 Betriebsanweisung Seite 34