NEC VT615 User Manual page 106

Correcting Pincushion Mode [Pincushion]
If the horizontal and vertical sides bend outwards, use [Pincushion] to correct the distortion. For more information, see
" Adjusting Pincushion or Barrel Distortion [Pincushion]" on page 42.
Selecting Cornerstone Mode [Cornerstone]
This option allows you to correct trapezoidal distortion.
Selecting this item will display the Cornerstone adjustment screen.
Use the 3D Reform feature to correct (3D Reform correction) distortion to make the top or bottom and the left or right
side of the screen longer or shorter so that the projected image is rectangular.
1. Press and hold the 3D REFORM button for a minimum of 2 seconds to reset current adjustments.
Current adjusments for "Pincushion", "Cornerstone" or "Keystone" will be cleared.
2. Project an image so that the screen is smaller than the area of the raster.
3. Pick up any one of the corners and align the corner of the image with a corner of the screen.
Projected image
Screen
The drawing shows the
upper right corner.
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6. Using On-Screen Menu