Problems of Lighting in Color Television Outdoor Broadcasts

Lighting conditions in color television outdoor transmissions are taken into consideration. Their greatly varying illumination levels and color temperature, contrast ranges and light quality give rise to considerable difficulties. The relation between camera sensitivity and lighting techniques is discussed. Quality factors which determine the required and necessary exposure level are set forth. The roles of camera sensitivity, signal-to-noise ratio and focus are described. Adjustment to different color temperatures by means of conversion filters, adjustment of camera electronics, and the effect of mixing light sources with different color temperatures are considered. The suitability of diverse types of lamps for outdoor TV broadcasts is explored, with special emphasis on the color rendering of modern metal halide lamps. Experiences with lamps of the type b at the Olympic Games are mentioned. Color Rendering Indexes Ra2, Ra6 and R13/6 were obtained for five specific types of lamps, using the EBU-standardized matrix coefficients. The reproduction of skin colors as well as color reproduction by color film is discussed.

Print ISSN

0361-4573

Published

1974-01

Content type

Original Research

DOI

10.5594/J07618