Bluefish444 Create3D Bedienungsanleitung PDF herunterladen (Seite 94)

The chroma keyer is a so called vector keyer, where you choose a background color (usually

green or blue) as a vector in the color wheel. 'Perfect' blue points to the top of the wheel, red is at

120 from the top, and green is a further 120 degrees from red. But you can adjust this by setting

the Angle slider. The color wheel will be updated accordingly. You will be rarely fortunate to have

a homogeous background color to key out easily, even with the best lighting, there will be various

shades of the background colour. By adjusting the Range slider, you can allow more and more

shades to be keyed out. You should take care to set the slider to a value that makes as much of

the background to disappear as possible but not higher than needed. The maximum range is 89

degrees.

Feathering, minimum radius and radius modifier are settings that help you fine tune your key,

making the already almost invisible parts of the background to disappear completely but keep

parts of the foreground (usually around the edges of foreground objects). If you need to set the

minimum radius to a high value to achive a good result, that is usually a bad sign that tells you

that lighting is not perfect and the background is not even close to being homogenous. With

Minimum and Maximum Luminance, you can 'discard' very dark and very light areas where

keying would occur by mistake. Those pixels that are either darker in luminance the the value set

as minimum or lighter than the maximum are not keyed.

No matter how careful and good the lighting of your chroma shot, the background color always

gets reflected on objects in the foreground. Even if keying is precise, you still get a blueish or

greenish tint around the edges or even anywhere on areas you want to keep. You can set the

amount of color suppression with its corresponding slider that helps you reduce this unwanted

tint. You should always start at a value around the somewhat less than the middle of the range of

the slider, because too high values can have unwanted effects as well.

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 124 125

Keine Kommentare

Bluefish444 Create3D Bedienungsanleitung Seite 94