Primatte chromakey technology
Primatte is a brand of
Workflow
Primatte is usually activated on a foreground image with a person or other foreground object filmed or digitized against a solid colored background or backing screen; usually a
If the foreground object was filmed close to the backing screen or with less than ideal lighting conditions, the foreground object will usually have ‘spill’ somewhere on it. This is most common when filming blonde people against a blue or greenscreen as their translucent hair will absorb the backing screen color. Such ‘colorspill’ can be removed and replaced with several options to achieve a more realistic result.
Another problem is chromakeying images that were created on film stock is that some film stocks have a distinct ‘film grain’ to them. A large amount of film grain will often cause rough edges around the foreground object. Rough edges can be minimized to achieve a smoother transition between the edges of the ‘chroma keyed’ foreground object and the user selected background image.
History
The Primatte algorithm was created by Yasushi Mishima while working at
It was initially released as a stand-alone product on
The Algorithm
The Primatte chromakey algorithm is a method of color space
Primatte works in 3D RGB color space. Here is a visual representation of the Primatte algorithm after an image has been processed.
The user essentially creates three
See also
- Computer Generated Imagery
- Chroma key
- Special Effects