Your email address will not be published. Blog Categories. Follow NyalAF. Search for:. Image brightness targets and calculating foot lamberts from projector lumens March 25, 10 Comments Leave a Comment. Brightness, or more correctly luminance, is a quantifiable measure of the amount of light from a display: Luminance is often used to characterize emission or reflection from flat, diffuse surfaces. Luminance targets Targets for luminance depend on the amount of ambient light in the viewing environment.
There are two factors which might increase the luminance target we aim for when designing a projection system for a home theater: Subjective preference.
Some people like an image that is brighter than commercial cinema targets. Drop off in light output from bulb based projectors. To counter this we might aim for an initial brightness of 28ftL and an end of life brightness of 14ftL. Hi Marcel Thanks for your comment. Hope that helps! Hi JR, thanks for reading. Thank for a rapid answer…………. Many manufacturers can't come close to hitting their advertised numbers, which is why reviews and review numbers are so important.
Harris - I should have clarified that in the formula I gave you, the assumption was that the screen was a most common 16x9 or 1.
It's gotta be getting harder to recommend projectors with the CR, size, and price you can get modern TVs at. I'm quite split in terms of my next upgrade. I see that point of view, Austin. But as Terry and some commenters discussed in his last column that asked the question " Why Projection? I think there's a lot that goes into the decision about whether you go with a large TV or a projector having to do with budget, viewing conditions, and what you're really trying to accomplish with your viewing experience.
So I don't dismiss the tremendous progress being made with direct-view displays or how impressive they are. But I really see these as being two very different animals. Daniel S. Did I miss something here? You are advising someone "hcd" with a "completely dark room" that is "dedicated [to home theater]" to install a projector that will produce foot-lamberts in that completely dark room, just to jack up the contrast ratio? If "hcd" was asking instead about widescreen format with a " diagonal, which has about s.
Professionally designed movie theaters are generally only around foot-lamberts, if I recall correctly, so your recommendation is way out of range. Will sunglasses be included with that movie projector? Daniel and hcd - Perhaps what you were missing was the whole story I've been there before.
I recommended the largest light engine I could, this side of a commercial theater. Your post caused me to do the actual calculation. Turns out, that verified he has a 16x9 aspect ratio. When not provided with gain info, I always assume a 1. That calculation using hcd's data and my lumen recommendation yields a desired off-screen light output of a tick under 55FtL.
If he has a matte screen 1. So, yes, I stand by my recommendation because POST calibration reality is that calculated peak white always goes down In hcd's scenario , my expectation would be we'd end up in the mid 40's, even with the larger gain screen. This blog discusses the three versions of HDR that are now gaining some support in consumer products and talks about the capabilities and role for each. The following discussion is talking only about UHD videos that have been authored and encoded to support High Dynamic Range HDR where extra bright highlights in the image, such as sunlight reflecting off of a shinny surface, are intended to be displayed substantially brighter than e.
HDR10 is a version of HDR that offers a bit depth of bits per color where the level of each of the primary colors can be represented digitally using a bit which means bits total for the 3 primary colors. While bits allows for possible luminance values, for UHD video the range used for the video information is restricted to the range of 63 to By comparison the 8-bit encoding used for HDTV is limited to the range 16 to Going from 8-bit encoding up to bits allows, for example, the grey scale going from black to maximum white to be encoded in much smaller steps.
This not only reduces the occurrence of visible banding in the image, but also supports the ability to represent a wider dynamic range. This was well before the first widely available source of UHD content with HDR10 become available in the spring of , in the form of Ultra HD Blu-ray discs and currently also from several video streaming services.
HDR10 is an open standard that is royalty free. In the world of home theaters using projectors, we usually talk about the picture brightness off-of-the-screen in terms of foot lamberts where for a conventional home theater i. How many foot lamberts, or nits, you can actually achieve with a projector based home theater setup depends on the actual lumens output of the projector, the size of the projected image i. GS50 is the world's first p outdoor smart projector with 2.
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