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Digital Projection INSIGHT 4K Dual LED & Quad Series
APPENDIX E: GLOSSARY OF TERMS
Lens extension
Notes
The distance between the front of the projector and the front of the mounted lens. When a long lens is intended to cover a relatively short
throw
distance, lens extensions should be taken into account when calculating the
throw ratio
as the error margin for such calculations
should not exceed 5%.
Letterboxing
Black margins at the top and bottom of the image. Letterboxing appears when a wider image is packed into a narrower
frame
without
changing the original
aspect
ratio.
Lumen
A photometric unit of radiant power. For projectors, it is normally used to specify the total amount of emitted visible light.
Noise
Electrical interference displayed on the screen.
Overlapping region
See
blend
region.
Pillarboxing
Black margins at the left and right of the image. Pillarboxing appears when a narrower image is packed into a wider
frame
without changing
aspect
ratio.
the
Pixel
Short for Picture Element. The most basic unit of an image. Pixels are arranged in lines and columns. Each pixel corresponds to a micromirror
within the DMD™; resolutions reflect the number of pixels per line by the number of lines. For example, a
1080p
projector contains 1080
lines, each consisting of 1920 pixels.
Pond of mirrors
Area around the periphery of the
DMD™
containing inactive mirrors. The pond of mirrors may cause artifacts, for example during the
edge
blending
process.
Reference Guide
Rev B June 2016
page 70
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