Color adjustment of broadcast and consumer monitors

One main application of spectraval is the measurement and calibration of monitors. The software JETI LiVal allows to select the RGB values of the primaries (gamut triangle) and the white point according to different standards (e.g. EBU 3213/ITU and SMPTE-C) or to define or measure individual values. The RGB measuring result is shown by numbers and by bars for a convenient adjustment.

Additionally, it is possible to use special software packages of external suppliers as CalMAN, LightSpace and ChromaPure (please see third party software).

Filter based (tristimulus) instruments are mainly faster than spectroradiometers, but they can suffer from a mismatch of their three measuring channels to the defined color matching functions (CMFs), known as error f1. Therefore, often spectroradiometers are used to profile the filter instrument and afterwards the filter instrument is used for all following measurements on this screen. If a monitor with a different spectrum has to be measured, then the profiling must be repeated on this monitor (please see application "Correction of tristimulus instruments").

The calibration of monitors is a task for the professional fields of broadcast and postproduction as well as for application in the home theatre and for PC screens. In the professional applications often Look up tables (LUT) will be created with the measurements. The result of office and home applications are often color profiles as ICC.

JETI offers a straylight protection tube for spectraval 1501/ 1511 to avoid the influence of surrounding light on the measurements.

It is known for many years, that the CIE Color Matching Functions of 1931 do not fully match with the visual impression of the observer (please see application "Alternative color matching functions"). This becomes evident, for example, if two monitors of different technology, e.g. an OLED and a CRT screen, are set to the same color coordinates xyY, but they appear different, if compared. Therefore, alternative color matching functions were developed, which can be used to minimize this mismatch.