Adjusting The Input Balance - Barco XLM H25 Owner's Manual

6.4.5.2 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 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
Image 6-6
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 6-7
Black balance
1. Push the cursor key ↑ or ↓ to highlight Input balance. (menu 6-32)
2. Press ENTER to select.
The Input balance menu will be displayed. (menu 6-33)
3. Push the cursor key ↑ or ↓ to highlight Black balance.
4. Adjust the red black level on a minimal value
5. Press ENTER to select.
6. Adjust the Brightness to a maximum value until there is just no green noise visible in the black areas.
7. Adjust with the ← or → cursor keys until there is no red noise visible in the black areas.
8. Adjust with the ↑ or ↓ cursor keys until there is no blue noise visible in the black areas.
R5976690 XLM H25 03/09/2004
B
6. Adjustment Mode
61