8. Image Menu
Black level setting : brightness
White level setting : contrast
The same absolute black and white level for the three colors allow the same reference for Brightness and contrast control of the
picture !
These two references also set the range in which the ADC willwork for that particular source (this explains also why each input
balances ettingis linked to a particular source and thus saved in the image file).

8.9.2 Adjusting the input balance

How can it be done ?

Tobalance 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. Thesource in question must be able to generate a white signal, ideally a 100% white (background) full screen pattern
2. Thesource in question must be able to generate a black signal, ideally a 100% black (background) full screen pattern

A

B
Image8-36
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).
Thechangeove rfro mm in to max is indicated by the apparition of bright spots also called “digital noise”
Analternative to a full screen White/black patternis the standard gray scale pattern, th e white bar will be used
forwhite balance and the black bar for black balance.
Image8-37
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