Crystal Vision
Using Safire 3
Foreground Tints
If the foreground objects contain similar colours to the backdrop colour there is a
likelihood of those colours being de-saturated by the suppression process. The
FG
Acceptance
window control can be narrowed to minimise this effect but
sometimes a wider acceptance angle is necessary to suppress all the backdrop
colour. In that case the
Foregrounds Tints
control in the Hue & Balance menu
can add colour back to the suppressed FG.
Lighting Compensation
The light output from a studio light often fades towards the edges which results in
a non-uniform key signal requiring more key gain to even it out. The
Lighting
Compensation
controls in the Lighting Compensation menu boost the key at the
edges, or radially. Auto Setup will automatically adjust these controls if enabled.
Colour Adjust
In the Brightness & Contrast menu, Safire 3 has controls that enable the final
composite image to be as realistic as possible. These include individual Lift, Gain
and Chroma level control of both FG and BG signals. Also available in the
Foreground Colour Correct menu are
FG RGB Gain/Lift
controls. Here the BG
has been darkened and the FG red gain increased slightly to give a sunset feel:
Keys and Masks
See section - ‘Key Signals’ for more information on how keys and masks
combine.
In addition to chroma keying, Safire 3 can generate an internal linear self key
derived from the luminance of the FG signal. Enabled in the Keys & Mask menu,
this can be used to key a caption into the background video and fill with a matte,
black or video. In the picture below the Crystal Vision logo signal is the FG input
and is self keyed into the BG signal using the FG signal as both key and fill.
(Note: The model in front of the green backdrop is the BG signal in this setup).
Safire 3 User Manual R1.3
61
24 March 2017
