JUST product lines are available in a range of standard sizes, configurations, light sources and viewing geometries for both 2- and 3-D objects. From portable viewing tables, to booths, stations, overhead fixtures, monitor-to-object proofing, and multi-spectral programmable LED lighting, JUST address a diverse range of needs.
Colour matching with standardised light D50
The CIE Standard Illuminant D50, with a correlated colour temperature (CCT) of 5000 Kelvin, is the predominant reference illuminant used in the graphic arts industry. This encompasses organizations involved in the creation and production workflow for graphic materials, from photographers and advertising agencies to prepress and reprographic businesses. The consistent use of standardised lighting throughout this value chain is indispensable in supporting accurate and consistent critical colour assessments of monitor soft proofs, hard copy proofs and prints of all types.
Graphic Colour matching to ISO 3664:2009
The D50 light source referenced in the standard ISO 3664:2009 "Graphic technology and photography – Viewing conditions" is defined by the CIE with a specific spectral energy distribution between 300 nm and 780 nm in increments of 5 nm. Other conditions to be fulfilled by a standardised viewing device in accordance with this standard are chromaticity coordinates (x and y for the 10° observer) with a tolerance of max. 0.005°, a general colour rendering index of Ra > 90, and metamerism indices of MIvis < 1.0 and MIuv < 1.5. The metamerism index further defines the quality of the light source simulating the D50 illuminant in the visible (VIS) and UV ranges. The UV aspect of this standard is particularly important given the prominent use of production materials containing optical brightening agents (OBAs).
Colour matching with standardised light D65
With a correlated colour temperature (CCT) of 6500 K, D65 corresponds to "average daylight from the northern sky" and is the reference illuminant in DIN 6173-2 "Colour matching" and a referenced illuminant in ASTM D1729. Its spectral energy distribution between 300 and 780 nm is described in DIN 5033 at increments of 5 nm. Any lamp designed to simulate D65 must comply with standard ISO 3668 "Visual comparison of the colour of paints". The standard describes all the parameters required to ensure standard-compliant colour comparisons, such as standards presentation, viewing and ambient conditions. The illuminance level defined in this standard is between 1000 and 4000 lux, this wide range being due to the diversity of different applications. JUST viewing booths and luminaires achieve an illuminance of 2000 lux as standard, with optional brightness controls on soft proofing models.