Barco HDX series, User And Installation Manual

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9. Image
Image 9-27
Image settings, color temperature
2. Press ENTER to select.
3. Use the ▲ or ▼ key to select Custom Balance . Press ENTER to accept.
Image 9-28
Custom color temperature
4. Select Gain Red and press ENTER . Use the ◄ or ► key to adjust the red gain.
Select Gain Blue and press ENTER . Adjust the blue gain in the same way as the red gain using the ◄ or ► key.
5. When fi nished, press EXIT to return.
9.3.7 Input Balance
9.3.7.1 Introduction to Input Balance
Introduction: Unbalanced color signals
When transporting signals, there is always a risk of deterioration of the information contained in the signals.
In case of information contained in the amplitude of the signals which is the case of data color signals (R, G, B),image 9-29 , we are
quite sure that the amplitude of these color signals is subject to alterations.
An example of alteration may be a DC component added to the signal, in the form of a DC offset repositioning the black level, since
this
black level ( “brightness” ) will become crucial later on (clamping circuit) it will result in “black not being black”.
Another value that is subject to alteration is the amplitude of the signal, resulting in an altered “Gain” of the signal ( “white level” or
contrast ).
The alterations of the three color signals will happen independently i.e. the colors will end to be unbalanced, image 9-30
B
Black level
0.7V
Image 9-29
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