9. Image
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 file).
9.3.7.2 Adjusting the input balance
How can it be done ?
To balance the three color signals of a particular source there are conditions; in fact we must know the bl
ack 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 9-31
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”
An alternative to a full screen White/black pattern is the standard gray scale pattern, the white bar will be used
for white balance and the black bar for black balance.
Image 9-32
How to adjust
1. Press Menu to activate the menus and select Image → Image Settings → Input Balance . (image 9-33, image 9-34, image 9-35,
image 9-36)
2. Press ENTER to select.
3. Do you want to use an internally generated test pattern ?
If yes, use the ▲ or ▼ key to select Adjustment Pattern and press ENTER to toggle between [on] and [off]
If no, adjust on the selected source.
4. Use the ▲ or ▼ key to select Red below Black balance and press ENTER.
5. Adjust the red black level on a minimal value
6. Use the ▲ or ▼ key to select Black balance blue and adjust the blue black level on a minimal value.
Note: This m inimal value is not necessary , provided that the 2 other colors are not influencing too much the color to be adjusted,
in fact the aim is to minim ize th e effect of the two o ther colors since there is a risk of reaching too soon the 50% transition
due to the contribution of these two other colors signals.
R5905158 HDF W SERIES 10/07/2012
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