Crystal Vision
Using Safire 3
8 Using Safire 3
In this section, when we refer to ‘FG’ and ‘BG’ we are referring to the FG and BG
input video signals. FG is the signal with objects placed in front of a coloured
backdrop. BG is the signal that will replace the coloured backdrop in the final
composite. Whereas, to avoid confusion, ‘foreground’ and ’backdrop’ refers to
parts of the FG image.
Here is an example of a FG image:
The model is sitting in front of a green backdrop. The backdrop can be of any
uniform colour provided the foreground objects don’t contain exactly the same
colour. The backdrop must be well and uniformly lit and the foreground objects
placed at least 2m in front to reduce colour tinting from backdrop reflections (see
section - Chroma Key Tips).
The BG image will appear behind the foreground objects in place of the
backdrop. Here is an example of a BG picture:
Safire 3 User Manual R1.3
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24 March 2017
