It is extremely important to have the absolute blackest masking to do the job and here is why.
When you are watching dark projected content such as night scenes and space scenes in movies or television that is masked off, the lighter colored mask panels (shown below) are still visible. If the purpose of having a masking system is to mask of the projected black bars but you can still see them, then the masking system is not serving its purpose. Our black hole audio transparent and solid mask panels are completely non existent in dark scenes.
Why does this matter? The projectors unused projected black bars get masked off by these mask panels. Even though the projector is not suppose to be projecting light in this unused black area, light still gets through. In order to effectively take advantage of the perceived increase of contrast that masking offers, the mask panels need to completely absorb that strayed light and disappear.
The following picture shows the mask panels from SmX, Stewart and Screen Research all laid out side by side and were shot outdoors on a bright sunny afternoon in direct light to show you what happens when direct light hits the masking panels.
The following shot is unaltered besides being cropped, resized and text added to it.
Click the Image below to enlarge
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