Video Projection Formulas
– a Primer by Anthony D. Coppedge, CTS
I'm frequently asked to explain how much ‘horsepower' (brightness) a projector needs to have in order to make the image on a screen look good. In a moment, I will give some formulas that are very necessary in determining projector brightness and screen size. However, two 'red flags' popped into my head.
First, it's a bit technical, and some will not understand the concept.
Second, while the formulas are not a big secret, they are a necessary part of how I make a living as a consultant. However, I can honestly say that MOST firms that I've run across do not perform all of the math required to make the estimates for screens and projectors as accurate as possible. How do MOST do it? They guess.
Trust me, I'm about to get to the formulas, but this is important.
Most A/V firms 'guess' in that they have done several (if not dozens) of installations. Some of these individuals have developed an 'eye' for guessing approximate values. Some are even very good at this, and, to be honest and try to sound humble, I usually am very close by guessing myself.
But how much money is being invested here? Is that money worth a good 'guess-timate', or is it worth an accurate, calculated proposal? I prefer the latter.
So, here are the basic math formulas necessary:
Determine screen placement
Sightlines are paramount in determining screen location. Make sure everyone (especially those far away) have a clear, unobstructed view of the screen. In some cases, more than one screen is required. I won't go into screen viewing angels, as this has a lot to do with screen gain (or lack thereof) and front vs. rear.
Determine screen orientation (front or rear).
Rear is always best, but requires space behind the screen that is essentially useless for anything EXCEPT the projector (and possibly a mirror).
Determine screen size.
Measure the distance from the screen to the furthest seat that is in line-of-sight to that screen. If the majority of the content is video, divide that number by 8. That is the screen height. Remember that this is just one of many possible formats that will determine which number to achieve the screen height.
Continue >>>
Used by churches all over the world to help teach worship, the Experiencing Worship study can help your worship team too.
Your team will learn why we worship and gain a better understanding of how to worship.
One user said..."Your 5 week study course has made a tremendous impact on my life in the study of worship... I would like to express my thanks for a well written study course that leads into a higher realm of praise and worship."
This is the debut album by EXW friend Paul Langford. Paul is a Chicago based singer, arranger, keyboardist, producer and conductor. Paul has a career that spans 14 years. Paul's work includes arranging for groups like GLAD, Voices of Liberty, VoiceTrek, The Chicago based "Caroling Party" and Day of Discovery Singers. His arranging has appeared on recordings side by side with greats like Gene Puerling and David Maddux, and he has sung with Don Shelton, Bonnie Herman and Bob Bowker, among others.