Barco Baron 908 R9040060, Owner'S Manual

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Contrast modulation
Why contrast modulation ?
In multi-screen installations, the goal is to obtain a continuous matched image, forming one homogeneous field-of-view with overall
light output uniformity.
The laws of physics applied to projection CRT and optics dictates that the center of the projected image will be brighter than the corners,
this phenomenon is normally referred to as 'corner fall off'.
Secondly, due to the normal off-axis projection of the red and blue images, CRT projection displays a phenomenon referred to as
'color shift', whereby one side of the screen is "redish" an the other "blueish.
image 5.2
Contrast modulation
Without contrast modulation
Corner fall off Color shift
With contrast modulation
50%
100%
50%
100%
image
50%
100%
50%
100%
image
blue red
green
b
lue
red green
horizontal light output
v
e
rtical light output
v
e
rtical light output
horizontal light output
Corner fall off Color shift
50%
100%
50%
100%
image
50%
75%
100%
50% 75%
100%
image
horizontal light output
v
e
rtical light output
v
e
rtical light output
horizontal light output