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Projector guidelines

  • From: P3D William Carter <wc@xxxxxxxxxxxxxxxxxxx>
  • Subject: Projector guidelines
  • Date: Fri, 11 Oct 1996 06:10:05 -0700
How bright?

The ASC recommends the following:

The screen brightness shall be measured from the viewing or seating area 
with the projedtor funning and no film in the gate using a meter calibrated 
in foot Lamberts.
(That would be with a spot meter, and any polarizers in place)

The brightness at the center of the screen shall be from 16 to 18 foot 
Lamberts.

The horizontal light distribution shall be 70 to 90% of the center reading at 
a distance of about 5% of the screen width along the center line and inside 
the left and right edge of the screen.

The color temperature of the light returning from the screen shall be 5400 
degrees Kelvin. It is desirable to achieve this reading with no greater 
variation than plus minus 200 degrees K.

-- 
                wc@xxxxxxxxxxxx
    37deg 39.09'N x 122deg 29.56'W x 90'MLLW





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