APPENDIX D : CONTRAST MODULATION
The first 3 adjustments (horizontal red, green and blue) are used for horizontal light equalisation for the three specific colors separately. This compensates the error due to the different horizontal position of the picture tubes. One side of the image is reddish and the other side is blueish. This phenomenon is called Color shift.
The VERTICAL adjustment affects the three colors at the same time and corrects the vertical error in light output due to the projection angle (10.5 degrees).
C O N T R A S T
E Q U A L I S A T I O N
R E D H O R I ZO N TA L
G R E E N H O R I ZO N T A L
B L U E H O R I ZO N TA L
V E R TI C A L
C O N T R A S T
E D G E C O R R E C T I O N
L E FT - R I G H T
T O P - B O TT O M
Select with | or |
t h e n < E N TE R > |
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< EX IT> t o ret urn
3 3 8
Contrast equalisation ('Color Shift')
Highlight RED HORIZONTAL with the control disk and press ENTER. Only a red image is displayed. Use the control disk to equalise the light output on the left and right side of the image. The best result is ob- tained on a white image by looking on the left and the right side until both or equal, or by using a very sensitive light meter.
ENTER returns to the Contrast Modulation menu.
Repeat this adjustment for green and blue by selecting first Green horizontal and then Blue horizon- tal.
C O N T R A S T | |
E Q U A L I S A T I O N | |
R E D H O R I ZO N TA L | |
G R E E N H O R I ZO N TA L | |
B L U E H OR I ZO N TA L | |
V E R TI C A L |
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C O N T R A S T | |
E D G E C OR R E C T I O N | |
L E F T - R I G H T | |
T O P - B O T TO M | |
Select with | or |
t h en < E N TE R > |
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<E XI T> to re tu rn |
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| 3 38 a |
ENTER displays the red image.
EXIT returns to the Random Access Ad- justment Mode main menu
CONTRAST MODULATION
Remark : When the end of adjust- | ADJUST returns to the Operational mode. |
ment range is reached for red and |
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blue, the green image will be dis- |
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played too, to give you the mes- |
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sage 'end of adjustment range'. |
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The green image remains active |
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until a new selection is made. |
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APPENDIX D :
R5975238 BARCOVISION 701 MULTIMEDIA 070497 |
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