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A Typical Modern Projection Room.
compromise must be made between the maintenance of reflective characteristics and sound transmission characteristics. The greatest difficulty in maintaining reflective characteristics is caused by tar contamination due to patrons smoking in the auditorium. A proper system of regular resurfacing or replacement is necessary to prevent the reflection factor dropping too low and to correct the inevitable spectral shift. Each situation needs to be considered separately, account being taken of the type of ventilation plant and the inherent cleanliness of the locality.
Patrons look at the screen for long periods of time, yet the screen itself should be invisible to them. Any uneven deterioration will show up distinctly on highlights and pan shots, drawing the patron's attention forcibly to the screen itself as opposed to the picture image which they see normally.
Screen Surround
The fourth item, that of screen surroundings, is important if only because these surroundings are always within the visual field of the patron and when properly arranged help considerably to maintain the required atmosphere,
Whatever the form of surround or masking to the picture, symmetry is important, as the surround or masking is within the most sensitive part of the visual field and so, if masking lines are crooked, ragged or bowed, a sub-conscious irritation is set up which spoils the enjoyment. Too large an overlap of the projected image, uncorrected keystone distortion, and picture re-reflection from dusty masking, are other small items that tend to mar the ultimate result.
The apparent size of the picture image from different parts of the auditorium is another factor that must be considered. There is no enjoyment in looking at a postage-stamp from the rear of the auditorium, or for that matter in experiencing a stiff neck from gazing upward at an acute angle at a huge picture from the front of the auditorium. Experience, technical knowledge, and common sense can do wonders in providing an apparent picture size suitable for all parts of the auditorium. Draping of the proscenium has a great effect upon apparent picture size; a large proscenium opening draped with dark borders and legs will make even the largest picture look small by comparison. Intelligent draping designed from the picture viewing aspect is well worth careful study.