Dataton WATCHOUT User's Guide

Alignment
2
E
Adjusting the Edge Blend
Curve
1
B
Calculating the projector
alignment:
C 1 = A + B / 2
D 1 = C 1
C 2 = C 1 + B – E
A
C
D
When using multiple overlapping projectors, the projectors must be placed
carefully so the images match up, with no visible differences in the overlaps.
Each projector must be placed exactly in front of its proposed image center on
screen. There should be the same distance between the projectors as between
as the image centers (assuming a flat projection surface). You may want to
produce a separate alignment image for this purpose, with horizontal and
vertical lines outlining the display surface and the centers of the edge-blends,
and cross-hairs marking the center of each image.
In the example to the left, the wall of the room is used to ensure correct alignment.
A is the distance from the wall to the edge of the image and B is the width
of the image. Position the right-most projector so that both distances C and D
equals A plus half of B. The second projector’s C and D distances equal the
right-most projector’s values plus the image width B minus the edge-blend
overlap E. When measuring D, use the center of the lens as your point of reference,
not the projector’s body.
The projectors must be placed on a steady surface, out of reach for the audience.
Even the slightest nudge may ruin the alignment of a projector.
◆ HINT: By putting the alignment image past the edge blend layer(see “No
Edge-blend Past Layer” on page 130), you can view the full size of each
display. This makes it easier to ensure that the image fills each display exactly.
Use a one-pixel wide outline along the edge of the alignment image.
You can adjust the curve of the edge blends in the Preferences dialog box.
After making any changes, choose “Update” on the Stage menu to see the
effect. See “Edge-blend Curve” on page 122 for more details.
Chapter 4: Configuration 45