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Ambient Light Rejecting Screen FAQ’s
Q: I am interested in improving image performance (brightness, color, contrast, etc.) for projected images in a church sanctuary with high levels of ambient light. A salesperson recommended using a brighter 4700 lumen projector. Would this offer more noticeable improvement than using elite cinegray 5d screen material?
A: A brighter projector (higher lumens) will help with image brightness but it does not help with color contrast or black levels. Since the projected image performance is important here, a contrast-enhancing material such as CineGrey 5D® is essential. White materials will reflect all of the light in the room; the projected light, indoor lighting, and sunlight through windows and doorways, everything. Because of this, the ambient lighting will still spoil image performance even with a bright projector. Ambient light rejecting (ALR) screens such as CineGrey 5D® filter out indirect light allowing your projected image to be what your audience will see instead of the extra glare. In addition to that, the screen’s filter layers enhance black levels and color contrast. This means that shadows, textures and slight variations in color shading in the projected image can be easily seen. Without an ALR material, such detail and clarity will not be visible. As you can see from the photos below, a bright projector does not enhance contrast.
A: Elite Screens CineGrey 5D® is a color neutral smooth surface with sparkling elements to increase screen gain in an ambient light room environment. These special characteristics incorporates a diffusion layer over a highly reflective surface which scatters ambient light while improving picture performance with a brighter image.
The projector itself, however also plays a big part in creating a hot spot. Projectors highest brightness levels are focused in the center, and only about 70% to 80% in the corners. In other words, the uniformity itself is not spread entirely even across the screen, thus creating a brighter spot in the center area.
To combat this, we recommend the following.
Reduce the projector’s light output by choosing an economy mode
Install the projector further away from the screen, minimum of 1.5 x the image width
Go with a lower gain screen
A: Although matte white materials such as CineWhite® are ideal for environments where room lighting can be controlled, the image is easily washed out by ambient light. Ambient Light Rejecting (ALR) materials such as the CineGrey 5D® are suitable for environments where there are high levels of indirect (ambient) light. This material trades off on the wide diffusion uniformity of white materials in favor of a brighter (angular reflective) image. Elite’s CineGrey 5D® incorporates a diffusion layer over a highly reflective surface which scatters ambient light while improving picture performance with a brighter image. This includes color neutrality with enhanced black levels and improvement over Active 3D presentations.
Andrew Robinson, an industry expert, shared his thoughts with Elite Screens about the performance of the CineGrey 5D® ALR material, “…of all the features, the one that gets me and really speaks the most is the fact that the CineGrey 5D® material from Elite Screens is the most cost effective ambient light solution on the market today. This is why I use it and this is why I recommend that you check it out for yourself. Because, at the end of the day, we all want performance but we also want incredible value and these are two things that the CineGrey 5D® delivers in spades.” Click here to see video of Andrew Robinson’s endorsement of the CineGrey 5D®.
Q: I have an Ambient Light Rejecting screen but it does not seem to work. There are windows behind my projector and the picture is washed out; what can be done?
*Disclaimer: As great as ambient light rejecting screen technologies are, there are still certain laws of physics that define what should and should not be done with a specialty material such as this.
Main Answer: Ambient Light Rejecting (ALR) projector screens are specially formatted to reject the majority of off-axis lighting from the top, bottom, and side angles.
However if a strong light source is hitting the ALR material at roughly the same angle as the projector does, it will wash out the image.
There is an easy solution. I strongly recommend light blocking curtains or blackout shades to shield your room and to rely on the interior lighting that ALR screens work with.
Q: Why can't we use ambient light or ceiling light rejecting (ALR/CLR/CLR2) screens with ultra-short throw/short throw (UST/ST) projectors?
A: Ambient light rejecting is a generic term for a variety of materials that prevents projected content from being washed out by incident room lighting from either natural or manmade sources. Each of these materials incorporate some sort of reflective microstructures that allows for projected light to create a superb image while off-axis light is either absorbed or reflected away from the viewers field of vision.
ALR screen materials are typically made for standard “long-throw” projectors. As long as the projector and material are aligned in accordance with SMPTE standards, you will get optimal picture brightness, color-contrast, and black level dynamic range while off-axis light is essentially rejected. We have created videos and articles on proper video and seating alignment to achieve the proverbial “sweet spot” for picture performance. Because Short-throw and UST projectors spread out their light signal over a comparatively short distance, much of the light is off-axis and will therefore be rejected by the material.
Materials like our Starbright CLR® are specifically designed for UST projectors. Their reflective microstructures are aligned to reflect the upward spread light signal from UST projectors into a viewer’s field of vision. At the same time, the “CLR®” rejects other forms of off-axis light such as regular room lighting, window light, ceiling light or even the direct signal from a standard throw projector.
Q: How about using any “ALR” (Cinegrey®3D/5D or Starbright CLR, etc.) by Elite with a ceiling-installed UST/ST projector?
A: Ceiling mounted UST projectors will not even work with a Starbright CLR® material because the material is specifically orientated to reject “ceiling light” or any type of lighting from above. This means that the screen will reject any overhead light, even from a compatible projector. Theoretically, you could invert the Starbright CLR® material to match with an inverted UST projector but the alignment will still not likely align properly with the human eye to deliver the ideal “sweet-spot” picture performance.
ezFrame CineGrey 5D® Series
Q: I have a 16:9 (HDTV) home theater projector but I'd like to have a presentation that has a 2.35:1 (Cinemascope) aspect ratio on a 2.35:1 projection screen. Do I need an anamorphic lens for this?
Projector Placement for Angular-Reflective Screen
Notice to Installer:
Please use the following installation instructions to obtain superior optical performance from the Angular Reflective ALR (Ambient Light Rejecting) Screen.
- Angular-Reflective material is not compatible with ultra/short-throw projectors
- Minimum lens throw ratio 1.5x image width
- Ambient light must not come from the same direction as the projector
Since angular-reflective means that the projected image will reflect at the mirror-opposite angle, it is important to position the projector so that the viewer will get the best possible image.
- Step 1: Establish the general “eye level” of the viewers
- Step 2: Set the appropriate projection level
- Step 3: Adjust the screen height level and projection angle
Input Angle (A) = Output Angle (B) aligns with the viewer’s angle
A: The CineGrey 5D® and CineGrey 3D® is great for dark room environment also, but we must understand its limitations.
First of all, both materials have narrow viewing angles. So if you wish to have a wide seating arrangement after 80 degrees, you will notice a drop in brightness.
Second, because they are higher gain screens they reflect more projector brightness. This may tire your eyes, so we recommend using a less brighter mode if your projector has a such setting.
If that is not a problem, then these materials will work. And the best thing is, because they are angular reflective material, the projector’s light will not diffuse in all directions like a matte white material. Meaning that they will not scatter the projector’s light and create side lighting. Thus, eliminating the need to absorb it with black velvet or paint a room really dark.
Third, because both of these materials are made with a neutral gray substrate, the color balance and temperature will be exceptional. The dark gray also enhances contrast and great color saturation.