Ricoh Altair-PJ2 Series, Technical Training Manual

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Keystone
When you project an image onto a surface at an angle (because the
projector is not quite centered on the screen), the image will be larger at the
top than at the bottom (in the case when the projector is on a table pointing
up at the screen).
Modern projectors correct for this digitally, but calibration is needed.
Sub-contrast
Inputs from both computer interfaces must be calibrated.
VCOM, Gamma, Shading
These require the DPJ Adjustment Tool.