This article deals with the adjustment of digital projectors in cinemas, which can be performed with the spectroradiometer JETI specbos 2501 and the accessory Dolby/realD filter caps for 3D projection.
The installation of digital projectors in cinemas requires the adjustment of their color settings. This is necessary to compensate the individual influences of the theatre, e.g. screen reflexion parameters, the back reflexion from the audience and the effect of the security lights. JETI specbos 2501 can be used for this task, because it is small and fast to use.
The measurement is proceeded with the included universal radiometric software JETI LiVal. The measuring area is marked with a red cicle which can conveniently be seen on the projection screen (see figure). The measured colorimetric data can be transfered to the projector by the laptop (e.g. using WLAN). Alternatively it is possible to locate the laptop near the projector and to communicate with the spectraval device via Bluetooth. After the automatic correction of the projector settings a check measurement must be done to validate whether the required values are achieved.
Measurement of projector