Adobe Stock © Carlo Toffolo
Opening photo: Colour perception is dependent on personal experience as well as illumination and surrounding observing conditions. As the ambient conditions are highly variable and not consistent at all, it is required to standardize common lighting situations.
ANALYSIS
Let There be Light! Tinka Zavcer BYK-Gardner GmbH – Geretsried, Germany
tinka.zavcer@altana.com
1. Colour harmony under various lighting conditions
The CIE defined several standard D illuminants
surrounding observing conditions. As the
with D65 being the most important one. The
ambient conditions are highly variable
Uniform colour is directly associated with high
lamps used in a light booth must simulate D65
and not consistent at all, it is required to
quality and influences our purchasing decision.
as close as possible. Until now, fluorescent
standardize common lighting situations
This is especially true for multi-component
tubes were used to simulate D65. A new unique
(ref. Opening photo). The illumination
products consisting of different materials
lighting setup is now able to achieve class A
should be easily switchable in order to
and or being produced by different suppliers.
quality by simulating CIE D65 with a smart
observe and avoid so-called “Metamerism”,
The human eye is often the final judge for
combination of filtered halogen lamps and LEDs.
i.e. differences in colour matching when
approving a new design. Therefore, the visual
lighting conditions change. In order to
to guarantee repeatable visual results. The
2. Standardization of visual colour evaluations
most important colour match is under natural
Colour perception is dependent on personal
testing procedures defining the following
daylight.
experience as well as illumination and
components: [1][2][6][7][10][12][13]
inspection conditions need to be standardized
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N. 59 - SEPTEMBER/OCTOBER 2019 - international PAINT&COATING magazine
guarantee reliable testing and evaluation conditions, international standards specify