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SCREENS 153
Light Tone
(26) Color, shade or tone of reflected light may be influenced to some extent by the character of the screen surface but without appreciably decreasing its power of reflection. Some theatres, employing the same light source, vary among themselves in the character of their screen illumination. Some have a sharp, harsh light; in others it is mild and pleasing. This may be due to factors other than the screen or it may be due to differences'in the screen surfaces, though not necessarily to differences in surface tinting.
(27) Theatres using a mazda projection light source should install the most brilliant screen surface purchasable, paying due attention to the diffusion of light necessary to their auditoriums. Light source in such theatres would be limited in power and of a pale amber tint, as compared with an arc light. The problem, thereforce, is not to reduce harshness, but to procure a screen surface that will reflect the highest possible light reflection characteristics.
(28) On the other hand, theatres using high power, high intensity arc lamps, which provide the maximum amount of projection light, but of a more or less harsh tone, should have a screen surface of less brilliant white in order to reduce the harshness. This is another problem that deserves consideration by the exhibitor and projectionist.
Type of Surface — Side Angle Distortion
(29) As previously indicated, some reflecting surfaces will distribute or diffuse light evenly all over a wide auditorium while others will not, concentrating a large percentage within a relatively narrow angle. The first are diffusing, the second specular surfaces, and between these extremes are many different grades.
(30) Which surface will give uniformly best results in any specific auditorium will depend upon the width of the seating space near the forward end, height of balcony above main floor, and the nearness of front seats to the screen.