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Presentation Environment Rule of Thumb
Viewing Angle
The extreme right and left seats in the front row must not be at an angle greater than 50 degrees from the center of a screen; No more than 35 degrees is optimum for most screens.
Viewing Distance
Optimum viewing distance from an image is 2 - 8 times the height of the image.
Image Height
Max Viewing Distance / 8 = Minimum Image Height.
Screen Size
Normal dimensions of a projected image is 3:4:5.
Image height x 1.33 = Horizontal Image Length
Image height x 1.67 = Diagonal Image Size
Image/Character Size
The smallest graphic/character you should use at any projection distance can be calculated using the following basic formula:
h = .035 x D where "H" is height in inches and "D" is projection distance in feet.
Font Size
The smallest font size you should use in a presentation is 14 points.
Room Lighting
Whenever possible, eliminate any light that shines directly on and/or behind the screen. Light on the screen washes out the image; light behind the screen affects the human eye and the effective contrast of the image.
Footcandles on the Screen
ANSI lumens / Screen Area = Footcandles
Minimum Image Brightness
3 x (ambient lighting / 2)
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