Ross Vision - Page 345

Vision Operator’s Manual (v12.0 MD) Appendix B: Color Correction Parameters • Ops 19–5
The light gray line represents an offset applied to the entire video signal, causing the output signal
values to be shifted by the offset amount from the input signal values.
The dashed line represents an offset applied to the B section of the video signal. The full offset is
applied to the B end of the video signal and decreases down to no offset being applied at the A
end of the video signal.
The dotted line represents an offset applied to the A section of the video signal. The full offset is
applied to the A end of the video signal and decreases down to no offset being applied at the B
end of the video signal.
The Vision switcher can perform 3 types of Proc Amp offset corrections:
• Black Offset — Affects the A section of the video signal and how much, if any, of the
input video signal values are mapped to black in the output signal. Increasing the black
offset increases the amount of input signal that is mapped to black in the output signal,
thereby darkening the shadow areas. Decreasing the black offset decreases the amount of
input video signal that is mapped to black in the output signal, effectively lightening the
shadow areas. Further decreasing of the black offset decreases the output signal so none
of it is black.
Figure 19.4 Effects of Increased and Decreased Black Offset
• Cr Offset — Affects the Cr component of the chrominance video signal. Increasing Cr
offset causes the entire video signal to shift towards red, taking on a red tint. Decreasing
Cr offset causes the entire video signal to shift away from red, taking on a green tint.
Figure 19.5 Effects of Increased and Decreased Cr Offset
• Cb Offset — Affects the Cb component of the chrominance video signal. Increasing Cb
offset causes the entire video signal to shift towards blue, taking on a blue tint.
Decreasing Cb offset causes the entire video signal to shift away from blue, taking on a
yellow tint.
Input Value
Output Value
Standard
Increased Black Offset
Decreased Black Offset
White
White
Black
A
B
Input Value
Output Value
Standard
Increased Cr Offset
Decreased Cr Offset
Cr
Max
Cr
Max
Min
B
A