Practical consideration
1.When measuring contrast manually, operators should not wear white clothing since light reflected from white clothing can influence the measurement.
2.Unless otherwise specified the projection lens is set in the widest zoom position since zoom function can influence the measurement.
3.Measurement should be performed with Minolta Chromameter, Model
A1. BRIGHTNESS |
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Unit: | Lumen |
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Brightness: Default |
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Contrast:Default |
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W: width of projected image; H: height of projected image | ||||
A (Area) = W * H | (in meters) |
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ANSI Lumens = | L1 + L2 + L3 + L4 + L5 + L6 + L7 + L8 + L9 | (lux) ∗ A(m2 ) | ||
9 | ||||
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1
3
W
1
6
W
1
6
H
1
3
H
9
