Screen paint selection - High Ambient light - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 04-04-2020, 02:08 PM - Thread Starter
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Question Screen paint selection - High Ambient light

Projector: Optoma Gt1080Darbee
Ceiling mount: 4'1.5" Lens to screen
Throw .5-1
Existing screen material: Carl's Flexi-Gray
Dimensions: Approx 106.25 X 64.25 or 100.25 X 58.25 viewable 112"Diag
Lighting - Uncontrolled from left side windows, lamps at night

So this is kind of what I am working with. What I am looking for is deeper blacks. The lights will almost never be all off and the blinds are almost never closed because I need sun exposure or else i tend to get S.A.D. <-- Its a real thing.. lol.

I have a projector, which doesn't do terribly bad on video games, but dark movies are always gray instead of black, which has always annoyed me. There is some washout on the left side from the windows and on the right side from a lamp. I know that having the ceiling mount and the short throw also makes some difficulty. Changing the color temperature of the bulbs makes a big difference but lets take that out of the scope for the time being. My budget isn't large as I have some remodeling to finish up and then i will also be painting the room as well to reduce some light reflections etc. I might add some darkening blinds or something but that's not in play at the moment. So with current conditions, I'd like to find some screen improvements to improve daytime viewing in particular and nighttime viewing with lights on.

1.) I have seen a lot about projecting on black screens, is there a DIY method that works the same?
2.) Having a throw of .5-1 i am kind of concerned about hot spots. Do i need to be?
3.) I saw this thread avsforum.com/forum/110-diy-screen-section/1677826-easy-ambient-light-rejecting-screen-paint.html I was thinking maybe "Grey Metal" and 75% Glidden metallic. That would put me close to what i am currently getting for gain from my Flexi Gray. But, from what i was reading is that this would be a starting point only and there are better formulations for my purpose?
4.) Is there a recommended paint mix that would enhance blacks the most? I have read the Silver-Fire threads, I am really looking for something more dark than grey as I already have the flexi gray. Would i just add more colorant or do something else entirely?

Please bestow thy knowledge upon thee as I am thoroughly confused about what would be best for my situation. Help me AVSFORUM, you are my only hope.

P.S My post count is too low to post images or link.. but I have pictures.
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post #2 of 5 Old 04-04-2020, 02:15 PM
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I used this paint and it works pretty good:

https://ca.rosco.com/en/product/tv-paint
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post #3 of 5 Old 04-04-2020, 02:25 PM - Thread Starter
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Did you use the black or white?
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post #4 of 5 Old 04-04-2020, 02:37 PM
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Quote:
Originally Posted by wookielover View Post
Did you use the black or white?

Sorry, I used the white, which is actually a .6 gain grey.
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post #5 of 5 Old 04-04-2020, 06:03 PM
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Hello,

All things considered, the Rosco TV paint is pretty basic stuff that really offers little real advantage, especially in your situation. A Basic Grey simply attenuates "all light" and only lowers the black floor by virtue of the Grey tint itself.

In other words, it's almost like your throwing your image through a N-Filter. Your just turning down the vibrant aspects that come with 1.0> Gain like using the Brightness control.

So going elsewhere............

Do not discount the amount of Contrast boosting, deeper blacks, vibrant colors, and ambient light resistance you can get from a light to mid-shaded to darker shade of metallic infused Grey Paint "Mix"...and still stay at 1.0 Gain. (...w/no hot spotting...)

Silver Fire using no colorant is a overachiever but adding 3 oz of colorant will make everything do even better when dealing with higher levels of ambient light.

Flexi-Grey? Not remotely close to Silver Fire in every respect except not having to paint. Even so, it's always a case of optimizing the Projectors Lumen output with the screen size and Throw whenever you want to get the best possible results in ambient light.

Example:


Panasonic PT:AE8000u @ 16.5' Throw onto 140" diagonal with plenty of ambient light. Silver Fire v2.5 4.0






The entire end wall is painted in Silver Fire, and you'll note how intensely black the non-illuminated area surrounding the Image is. Therein lies the difference...if your screen is truly a hih Contrast surface that can maintain gain. Weak light gets attenuated. Intense light stays intense.



Now be advised that if you keep Window Shades / Curtains flung open at Noon, with sunlight flooding the screen area, while you image will be significantly better than almost anything else, your image quality will still take a hit. You'd have to drastically reduce your screen size (98" diag.)



By simply keeping any light from directly hitting the screen, you can realize some great image quality. When I see someone state that they have uncontrollable light coming from Window at the side of the Screen, I start to wonder how seriously that person is taking having "The Big Picture". Even thin, Gossamer-Style curtains in a Grey would make a tremendous difference. Frankly, if you've never tried at least modestly correcting your worst case light sources, you cannot appreciate how even small efforts can make big differences. As I said above...we / you can make it look a LOT better than you have had to settle for, but you'll still have to settle for something less than a perfect OMG level of image quality.



So dissecting your situation....first thing that comes up is getting the Format sizes right.


At 16:9 and 100" x 56" you'd have 115" diagonal with a 4' Throw...and with Silver Fire v2.5 4.0 you'd get 35 fl of reflected brightness. Light uniformity is well above 85% so no dark edges.


Here is a Link to a Thread where a ViewSonic PJD6683ws 3000 lumen Short Throw Projector was employed on a 106" diagonal Electric Tab Tension Screen painted

with Silver Fire v.2.0 4.0



Again....lots of ambient light...and dozens of examples to look at...from all sorts of angles at different levels of room illumination. It is amazing how bright a room can be as long as your not washing the screen surface with direct light.


https://www.avsforum.com/forum/110-diy-screen-section/1432177-painting-onto-106-tab-tensioned-screen-silver-fire-v2-5-4-0-a.html

A sneak peek:












You have to decide how good you want your image to be.There are no miracles...but there are some applications that work a lot better than others.
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Last edited by MississippiMan; 04-04-2020 at 06:46 PM.
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