Crystal Vision
Statesman
CoCo104 User Manual R2.0
47
26/09/05
Using colour space controls
Unless the CoCo104 board is in the bypass mode, the YUV processing will always be
active. RGB processing is only active, when RGB functions are enabled, and selected
RGB processing is applicable to the signal passing through the corrector/legaliser.
RGB processing prevents YUV signals from developing illegal values when transcoded
into RGB colour space.
Enabling RGB processing does not disable YUV processing.
Controlling YUV gain and lift
The YUV Gain & Lift menu provides access to Y Gain, Y Lift, U Gain, U Lift, V Gain, V
Lift.
YUV Gain & Lift controls
The YUV Gain & Lift control ranges and default values are as follows:
Y controls
Min
Default
Max
Y Gain
0
100
200
Y Lift (Black Level)
-512
0
512
U Gain
0
100
200
V Gain
0
100
200
U Lift
-512
0
512
V Lift
-512
0
512
Default values can easily be entered by clicking on individual Cal buttons.
The Input Presence, standard and Clip Active indicators are shown on the right of the
menu.
Note:
The YUV gain controls DO NOT reflect changes in overall YUV gain (video gain) applied
from the CoCo Controller panel. However, the Controller Video Gain control will attempt
to maintain the RATIO of YUV gains that are shown or selected in this menu.
Controlling luminance clip threshold and slope
The Y threshold menu provides access to the upper luminance clipping threshold and
slope controls and the lower luminance clipping threshold and slope controls.
