Catalyst Manual - Cal Stage

Chapter 11:
Keystone and Shutters
Keystone Correction
The shape of a projected image is affected by the angle of projection. A rectangular image
may appear on a wall as a trapezoidal shape. Keystone correction compensates for this
effect by allowing adjustments to the geometry of the layer’s image.
The eight Keystone Correction parameters each adjust one corner of the layer’s image
horizontally along the X-axis or vertically along the Y-axis.
y1
y2
x1
Layer Image
x2 x3
The suggested default DMX value for each parameter is 128, which equals no geometric
correction. Values less than 128 move the selected corner left or up; values greater than
128 move it right or down.
To activate the affects of the Keystone Correction parameters, the Visual Effects
parameter must be assigned to a DMX value of 5 (Keystone 1).
Image with no Keystone correction Image with Keystone correction
Catalyst® V3 Media Server User Manual 117
x4
y4
y3