I’ve had a long-standing love affair with spreadsheets, going back to the early days of Quattro Pro.
#Professional av sound projector console calculator install
If faced with this type environment, arrange for an in situ demo, and advise the customer that they will either have to install and close blinds or drapes, or throw a great deal of money at screen and projection technology to overwhelm the bright, ambient backlight. In general, if the background light is brighter than the projected image, your pupils constrict, allowing less light in, and the viewing experience is significantly degraded. When this situation occurs, human eyes can’t voluntarily isolate on the projected image. Second, is a scenario where significant ambient light surrounds the screen think large windows. There, a good CR value is much easier to achieve. If you have a reasonably sufficient budget, these goals aren’t too hard to achieve with today’s technology.Įxceptions to the 50/15 guidelines: First, is in a darkened room or theater. So, what are the objective goals for FL and CR? Based on my research and experience, a combination of 50 FL or more AND a CR of 15:1 or greater, will deliver a very good image under well controlled lighting conditions. I now knew what to look for, but I couldn’t find any published data describing how much of each was needed. CR is the ratio between the brightest color (white) and the darkest color (black) that a system is capable of delivering. FL being the amount of light that is reflected off a screen – or through, in the case of rear projection - and to the viewers eyes.
Standards organizations such as ANSI and SMPTE, and anything else I could find.Īs recently as a few years ago, actual guidelines and formulas were few and farīetween, unlike today’s AVIXA Image System Contrast Ratio standard.Īs I came to learn, the two key elements are Foot Lamberts (FL) and Contrast Ratio (CR). Little from each of the major projector and screen manufacturers, from I was looking for consistent ideas andĭirection, target values and formulas, but I couldn’t find much.
Research, in my spare time, to cobble together fragments of information, whichĬame from all corners of the industry. rear projection, throw distance, and ambient light. They include screen size,Īvailable projector lumens, usable projector lumens, aspect ratio, screen gain,īlack level, front vs. Oh my, was I wrong.įactor when calculating for brightness and contrast. Have some specific information relating to “industry standards” forīrightness and contrast. Or screen manufacturers would have calculators on their websites, or at least I figured this would be fairly easy to do. Mission to figure out a better way to objectively quantify my projectionĭesigns. Was repaired, the image came to life and was acceptable to all. Ultimately, the problem was resolved when our service manager found a badĬonnection on one of the extender cables that had been installed.
Given the screen size they needed, I just specified the brightest XGA projector they could afford. Remember, this was back at a time when cost-effective LCD projectors were just beginning to reach 3,000 ANSI lumens. He asked how I determined what projector to specify. It was then that a customer complained that a new projection system I specified was not “bright enough”. This adventure starts about 14 years ago.
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