High End Systems DL.3 - Manual (Page 140)

CHAPTER 11
Global Functions
118 DL.3 Digital Light User Manual
Keystone Correction Parameters
When you output an image from a
projector at an angle, the image may
appear skewed. Eight Keystone
parameters adjust the image shape
and compensate for this effect. You
can control each of the four corners
of the graphics output to reshape
your image to a form that projects
correctly.
Default DMX Value: 0 = no
keystone correction has been
applied. Each corner has an x and a y
value that adjust and correct scale of
the projection from any corner toward the image center on that axis.
Setting all Keystone X and Y parameters DMX values to zero will place the four corners of the
image at the four corners of the projector output. Adjusting keystone x values toward 255
(100%) moves the respective corner x positions horizontally toward the center of that image
edge. Adjusting keystone y values toward 255 (100%) causes the respective corner y positions
to be moved vertically toward the center of that edge of the image.
Tip: These parameters can also be used to create interesting skewing as a design effect.
Note: DL.3 fixtures have vertical lens shift capability that provides additional
keystone control. Engage lens shift with your DMX console in the Control
parameter for motion control, (see Control Parameter Projector Options on
page 181 for a description).
Top
Top Left X Top Right X
Top
Bottom
Right Y
Bottom Right X Bottom Left X
Bottom
Left Y
Right Y
Left Y
Original Content
Keystone Top Left X DMX value = 85
Keystone Top Left Y DMX value = 85
Keystone Top Right X DMX value = 85
Keystone Top Right Y DMX value = 85 Keystone Top Right Y DMX value = 170
All other Keystone parameter DMX values = 255