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5. PICTURE SURROUND
The fifth item is one of securing properly arranged surroundings to the picture and takes into consideration both the stage and that part of the auditorium within the audience's visual angle.
Proscenium versus Picture
In many kinemas, even of recent design, it is found that an illusion of small — too small — picture size is caused by the disproportionately large, proscenium opening. In this connection it is hoped that architects will design the proscenium, if such be needed at all, round the picture size as required by auditorium dimensions and seating layout, rather than attempt to create an impressive proscenium opening, the very size of which makes it impossible to fill it proportionately without making the picture unnecessarily large, to the ultimate detriment of screen illumination.
Fig. 8 shows how with two exactly similar size pictures, one will appear to be much larger than the other.
SCREEN
5. Minimum Lateral Viewing Angle.
SCREEN
Fig. 6. Maximum Vertical Viewing Angle.
Avoidance of Glare
A most important aim is the avoidance of glare spots which cause distraction, for glare causes discomfort to the eye which in prolonged exposure produces fatigue, and in its most intense forms may cause injury to the eye. It is seldom that glare spots in kinemas are such as to cause disability glare, but cases of discomfort glare are quite frequent.
Excessive glare lowers visual acuity, and when consideration is given to illuminated screen surrounds it should be remembered that a lowering of visual acuity wTill be experienced if the surroundings are at any time of a brightness greater than that of the picture.
Clocks and Exit Signs
The most usual offender where glare is considered is undoubtedly the clock or clocks which are nearly always placed at the sides of the proscenium arch.