Calculate Lens Offset - Christie D12HD-H User Manual

3.6

Calculate Lens Offset

• The vertical image offset (shift) ranges for the projector are +/-120%
(WUXGA) and +/-140% (HD). The horizontal image offset (shift) range for
the projector is +/-50% (HD/WUXGA).
• The method for calculating lens offset complies with Industry standards.
Example for Vertical lens offset:
- At 0% offset (or on axis), the center of the image is on the lens center,
so that half of the image appears above and half appears below the
lens center.
- At +100% offset, all (or 100%) of the image appears above the lens
center.
- The % offset is calculated as the ratio of the number of pixels shifted up/
down to half the image size. Examples for WUXGA:
 Shifting up 600 pixels gives offset of 600/600 * 100% = 100%
 Shifting down 600 pixels gives offset of -600/600 * 100% = -100%
 Shifting up 720 pixels gives offset of 720/600 * 100% = 120%
 Shifting up 240 pixels gives offset of 240/600 * 100% = 40%
WUXGA Projectors:
Vertical Image Offset: 0% Offset (WUXGA)
H Series User Manual
020-000772-02 Rev.1 (08-2015)
600 pixels
above lens
center.
600 pixels
below lens
center.
Section 3: INSTALLATION
No offset is applied - 0% offset.
Half of the image appears above lens center
and half of the image appears below lens
center.
Lens center
3-6