Kramer Electronics VP-790 - Manual (Page 19)

VP-790 Warp Generator – Preparing a Grid 17
Click the CREATE button to create the preset warp grid, as illustrated in
U
Figure 17
U
:
Figure 17: Initial Warp Grid for Convex Screen
The preset warp grid illustrated in
U
Figure 17
U
, displays the corrections for both the
keystone problem due to the position of the projector and the screen curvature.
The preset settings are fairly subtle compared to the setup given in this example
and are more suited to the more common setups with longer throw lenses and more
subtly curved screens used more often in practice. Despite this, it is very simple to
adjust this preset generated warp to match the setup in this example.
To do this quickly, Mirror in H in the Point Edit Control tools have been enabled
automatically by the preset creation function.
Before adjusting the shape of the grid in any way using Mirror in H, make sure that
the warped image is centered and has been scaled to the correct size for the
screen. If this isn’t the case, center the grid:
1. Enable the Move All function in the Point Edit Control located in the Grid
Editing section of the Evaluator Controls tool box.
2. Move the whole grid so that the center of the warped image is centered on
the projection screen/surface.
3. Disable Move All.