this diagram was from the website :http://www.hsc.csu.edu.au/entertain/industry/core/lighting/3220/information.htm#light_mixing
COLOUR MIXING:
colour mixing is combining the effects of two or more lighting gels and can be either subtractive (which is putting two lighting gels onto the same beam, so putting 2 gel lanterns to make one colour) or additive ( focousing two different coloured gel lanterns on the same spot to create a mixed colour)
Lighting Personnel
Lighting Designer
The role of the lighting designer is to work with the director, set designer, costume designer, and sometimes the sound designer and choreographer to create an overall 'look' for the show in response to the text, while keeping in mind issues of visibility, safety and cost. They also work closely with the stage manager on show control programming, if show control systems are used in that production. Outside of the theatre the job of a Lighting Designer can be much more diverse and they can be found working on rock and pop tours,corporate launches, art installation and on massive celebration spectaculars, for example the Olympic Games opening and closing ceremonies.
Lighting Operator
The lighting operator is the electrician who operates the light board. Depending on the scale and type of production, the board op may be responsible for conventional or automated lighting fixtures, as well as practicals and, in some instances, controlling video as well.
Sometimes, most commonly in small productions, the Lighting Operator will be the same person as the stage manager. Another variation in smaller productions has the responsibilities of Light board Operator and Sound operator combined into one position.
The light board operator may, in some cases, also be the lighting designer for a production.
Follow Spot Operator
The Follow spot Operator is the person who operates the follow spot, or spotlight on a production. This is a light which is physically moved by the operator, during the production, to follow a performer as they move around the stage. A follow spot may also have mechanisms to change color, as well as an iris to change the size of the beam of light. The follow spot operator may have to change several aspects of the beam from their unit simultaneously. This position is more common in musical theatre and concerts than for drama.
Lighting Technician
Lighting technicians are involved with rigging and controlling electric lights for art and entertainment venues or in video, television, or film production. In a theater production, lighting technicians work under the lighting designer and master electrician. In video, television, and film productions, lighting technicians work under the direction of the cinematographer and gaffer. In live music, lighting technicians work under the chief lighting technician, who reports to the production manager.
Lighting technicians are responsible for the movement and set up of various pieces of lighting equipment for visual effects. Lighting Technicians may also lay electrical cables, wire fixtures, install color effects or image patterns, focus the lights, and assist in creating effects or programming sequences.
