Calculating The Lens Offset; Wuxga Projectors - Christie DHD700-GS User Manual

Calculating the lens offset

Adjust the offset to align the image on the screen with full image size.
• The vertical image offset (shift) ranges for the projector are +/-50% (WUXGA) and +/-60%
(HD).
• The horizontal image offset (shift) range for the projector is +/-30% (HD/WUXGA).
• The method for calculating lens offset complies with industry standards. For example for
vertical lens offset:
• At 0% offset (or on axis), the center of the image is on the lens center, so half of the
image appears above and half appears below the lens center.
• At +50% offset, all of the image appears above the lens center.
• The percentage (%) offset is calculated as the ratio of the number of pixels shifted up or
down to full image size. For example for WUXGA:
• Shifting up 600 pixels gives an offset of 600/1200 * 100% = 50%
• Shifting down 600 pixels gives an offset of -600/1200 * 100% = -50%
• Shifting up 720 pixels gives an offset of 720/1200 * 100% = 60%
• Shifting up 240 pixels gives an offset of 240/1200 * 100% = 20%

WUXGA projectors

The following show vertical image offsets for the WUXGA projectors:
• Vertical image offset: 0%
GS Series User Manual
020-001044-02 Rev. 1 (07-2016)
Lens center
Installation
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