O'Reilly logo

Location Lighting for Television by Alan Bermingham

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

6

Colour Temperature/ND Filters

6.1   Colour Temperature – Defining White

Defining what we mean by ‘white’ is a major concern in colour television. The process of calibrating the colour camera ‘white’ point is known as white balance, in which the camera is exposed to a line-up chart or white card suitably lit with ‘white’ light. The camera’s autowhite balance facility equalises the RGB signals (R and B matched to G) so that the line-up chart or white card looks neutral or white.

Our perception process accepts many sources of light as white, e.g. daylight, tungsten light, fluorescent light, metal halide discharge lights, xenon lights etc. So how can we define what is meant by white? One convenient way is to use the concept of colour temperature ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required