Digital Projection Projector HIGHlite 740 Series User Manual

page 52
Operating Guide
USING THE PROJECTOR
Blend Width
Use this to set the width of the blended regions.
1 Top Blend Region
2 Bottom Blend Region
3 Left Blend Region
4 Right Blend Region
Black Level Uplift
Overlapping edges may appear lighter than the rest 
of the image. Counteract this effect by raising black 
levels in the rest of the image. The amount of uplift 
required will be either x2 or x4, depending on how 
many images are overlapped.
The following example shows a segment with 
overlapping...

page 53
Operating Guide
USING THE PROJECTOR
Reduce Black Level Uplift Width
Use this to correct for stray light from the pond of mirrors, the DMD’s inactive outermost mirrors.
In the example below, the blended image comes from two projectors, 1 and 2. Both images 
have black level uplift applied in their unblended regions; as a result,\
 artifacts 3 and 4 have 
emerged at the edges where the black level uplift region of one projecto\
r overlaps the pond of mirrors 
of the other.
To remove the artifacts,...

page 54
Operating Guide
USING THE PROJECTOR
Reduce Black Level Uplift Width (continued)
A detailed view of one of the projectors in a 
two-projector array:
1 Black level uplift region
This image occupies the left half of a 
two-projector array. Black level uplift 
has created artifacts on the edges of 
the blend region.
2 Artifact (left)
This artifact is caused by the 
other projector’s pond of mirrors 
overlapping the black level uplift 
region of this projector. It can be 
eliminated if the black level...

page 55
Operating Guide
USING THE PROJECTOR
Reduce Black Level Uplift Width (continued)
In the Reduce Black Level Uplift 
Width menu, settings correspond 
to coordinates within the unblended 
regions. Only relevant coordinates 
are enabled.
To remove the artifact on the left:
1. Open the Reduce Black Level 
Uplift Width menu of the 
projector on the left.
2. Adjust Upper Right X and 
Lower Right X.
3. Select Apply Uplift. The 
black level uplift region of this 
projector will withdraw from the 
pond of...

page 56
Operating Guide
USING THE PROJECTOR
Blending images from multiple projectors
The following procedure explains how to set up an array of projectors an\
d how to blend the images together.
Before you start
Position the projectors
Ensure that all projectors are in good working order.
Position the projectors so that they are within the required throw dista\
nce range. Position the screen where it will remain during operation.
In the initial stages of the procedure you will be using test patterns, \...

page 57
Operating Guide
USING THE PROJECTOR
Edge Blend procedure
1. Align the projectors as they will be used in the array.
Each projector should be perpendicular to the screen, or as close as pos\
sible. Ideally, each projector should allow for a minimum of 20% 
screen overlap where it is adjoined by other projectors. Overlaps should\
 be the same in size across the array.
How to align the projectors:
• Ideally, all alignment should be achieved by physically moving the projectors a\
nd by using the Lens...

page 58
Operating Guide
USING THE PROJECTOR
Edge Blend procedure (continued)
2. Ensure that all projectors are color-matched.
If necessary, use the White Field test pattern and test the light output of each projector. 
Ensure the Color > Gamut setting has the same value across the array.
Use Lamps > Lamp Power to compensate for different lamps. Even identical lamps change their light output with age an\
d use.
3. Enter the correct gamma setting.
Adjust the gamma setting using the Image > Gamma control....

page 59
Operating Guide
USING THE PROJECTOR
Edge Blend procedure (continued)
4. Set up the array.
For each projector, open the Edge Blend menu and enter Array Width, Array Height, Array H Position and Array V Position.
Array Width and Array Height should be identical for all projectors. These settings define the size of the array. For example, a two-by-
two array will have the following values:
• Array Width = 2
• Array Height = 2
The top left projector will have Array H Position = 0 and Array V Position...

page 60
Operating Guide
USING THE PROJECTOR
Edge Blend procedure (continued)
5. Define blend regions.
From the Edge Blend menu on all projectors, 
set Blending to Align Pattern.
Set up Blend Width on each projector so 
that the align patterns overlap perfectly and 
completely cover the blend regions (Fig. 2).
If necessary, physically move the projectors 
and/or use Lens Shift and Zoom again to 
align the array perfectly
Fig. 2
1 Left projector
2 Align pattern of left projector
The red arrow next to the...

page 61
Operating Guide
USING THE PROJECTOR
Edge Blend procedure (continued)
6. Uplift black levels (optional).
If you do not need to uplift the black levels, skip 
to step 8, Blend the images.
Switch all projectors to the Black Field test pattern.
The level of black will differ across the image as 
shown in Fig. 1. Uplift the black levels using Edge 
Blend > Black Level Uplift.
How to uplift black levels
Regions may be overlapped by two or four 
projectors. An array will always contain regions...