6. Advanced
Black level
Δ
G
ΔΒ
Δ
R
R
G
B
Image 6-53
The objective of input balancing
The objective in input balancing is to “set” the same black level and the same white level for the three colors of a particular input
source.
Black level setting : brightness
White level setting : contrast
The same absolute black and white level for the three colors allows the same reference for Brightness and contrast control of the
picture !
These two references also set the range in which the ADC will work for that particular source ( this explains also why each input
balance setting is linked to a particular source and thus saved in the image
fi
le).
How can it be done ?
To balance the three color signals of a particular source there are conditions; in fact we must know the black and the white level of
the source i.e. :
1.
the source in question must be able to generate a white signal, ideally a 100% white (background) full screen pattern
2.
the source in question must be able to generate a black signal, ideally a 100 % black (background) full screen pattern
A
B
Image 6-54
White balance : In the projector, we will set the contrast for each color until we get a 100% light output picture when projecting a
100% white image (image A)
Black balance : In the projector, we will set the brightness for each color until we get a 0% light output picture when projecting a
100% black image (image B).
The changeover from min to max is indicated by the apparition of bright spots also called “digital noise”
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Summary of Contents for iD LR-6 R9010342
Page 1: ...iD LR 6 User Guide R9010342 R59770134 01 27 05 2011...
Page 7: ...Table of contents Glossary 125 Index 127 List of images 131 R59770134 ID LR 6 27 05 2011 3...
Page 8: ...Table of contents 4 R59770134 ID LR 6 27 05 2011...
Page 28: ...3 Installation 24 R59770134 ID LR 6 27 05 2011...
Page 40: ...4 Setup 36 R59770134 ID LR 6 27 05 2011...
Page 44: ...5 Getting started 40 R59770134 ID LR 6 27 05 2011...
Page 68: ...6 Advanced Image 6 45 64 R59770134 ID LR 6 27 05 2011...
Page 72: ...6 Advanced Image 6 48 68 R59770134 ID LR 6 27 05 2011...
Page 130: ...Glossary 126 R59770134 ID LR 6 27 05 2011...