Originally Posted by Mrlance2019
Hey everyone, I recently just got a new hd39hdr and with the better zoom it has I realized my frame I built is too small now and I can go bigger, plus when I bought the material and installed onto a frame I got some ripples in it which is more noticable now lol. I bought a Carl's ultra ALR before , but this time around I was thinking about trying my hand at a silver high gain model. Found a 2.5 gain silver one on Amazon for under 300 but is and just curious what everyone's thoughts where on silver over a grey or white, we sit about 8-9 feet back, only big lighting is from the side window in the room which we bought blackout film for. Has anyone tried out a silver one before? I'm hoping to accomplish a bright vibrant image with good contrast , I feel the ultra ALR screen we have now can crush black detail in dark scenes too which is another reason why I was looking into something new
The HD39HDR's lumen output is not 4K, it depends on the mode:
Regarding the crushed blacks, there are several factors that are involved:
Having the correct settings for color space (16-235 or 0-255) from the projector and the source.
Having the image calibrated so the color space is not clipped.
For this there are two patterns required, the Black Clipping and White Clipping:
The projector's capacity to project good blacks/shadow detail. DLP's (and other pj types) in this segment have poor black levels.
Is the blackout film referring to Calr's ALR screen or blackout window shades? If they are shades how much light still comes through?
Shadow detail is affected by how much light is in the room. The light can come from windows, lights, and wall reflections.
Here is a good example and explanation of how just reflections from walls affect black detail:
To combat this, dark fabric is used on walls, or at least a dark paint.
The Carl's Ultra ALR has a claimed gain of 1.5. Going from this screen to one with a higher gain will not help with crushed blacks. The image with the HD39HDR and Carl's ALR should already be pretty bright and vibrant.
A negative gain matte screen (white or grey) will help with shadow detail. The matte screens don't have any ALR properties, so they will not reflect ambient light. Since they are negative gain, they will reflect less light back, depending on the rating. If the rating is 0.7, then it will reflect back 70% of the light.
Even though the ALR will help with ambient light reflections from walls, in a room with no lights other than the projector (and maybe some minimal light spill from the windows (if blackout shades are used)) a negative gain matte screen will have better black levels than an ALR.
Two good threads:
There is a 0.8 gain screen with ALR properties from XY screens:
A painted screen can have excellent results, at a lower cost:
What is the diagonal of the current screen?
LE: to avoid wrinkles use this technique when mounting the fabric: