What is Metamerism?
Metamerism refers to the phenomenon where two colors appear to match under one set of viewing conditions but may appear different under another set of conditions. It occurs when two colors produce the same visual sensation, despite having different spectral compositions. In simpler terms, metamerism is the perception of colors as identical despite differences in the light sources illuminating them or the observers viewing them.
Causes of Metamerism
Metamerism primarily occurs due to differences in spectral power distributions (SPD) of light sources and the spectral reflectance properties of the surfaces of objects. Our perception of color relies on the interaction between light and the surfaces of objects. When two objects reflect light in a similar manner across the visible spectrum, they may appear as the same color, even though their actual spectral reflectance curves differ.
For example, consider two paint samples that appear identical under daylight. When viewed under artificial lighting, one sample may appear slightly different from the other due to variations in the light source’s spectral output. This discrepancy in appearance despite the same daylight color match demonstrates metamerism in action.
Issues regarding Metamerism
Metamerism can lead to difficulties in achieving consistent color matching, especially in industries like printing, textiles etc. Despite colors appearing identical under certain lighting conditions, they may exhibit noticeable differences under different lighting sources, leading to mismatches and inconsistencies in color coordination.
Also, in industries where manufacturers assemble products using components sourced from different suppliers, metamerism can introduce significant challenges in ensuring color consistency across the final product. This issue is particularly prevalent in industries such as electronics, automotive manufacturing where products often incorporate a combination of materials and finishes from various sources.
How to Eliminate Metamerism?
Tools such as Spectrophotometers and Color Matching Boxes can be used to eliminate Metamerism as they provide different light sources, including daylight, fluorescent, incandescent, and LED to measure colors under different light conditions providing insights into how colors may appear under different illuminants. By providing consistent illumination across different spectral distributions, these tools enables precise color analysis and matching across diverse lighting environments, helping to identify potential metamerism issues and optimize color reproduction.
Qualiper offers a diverse range of models of spectrophotometers and color matching boxes to meet the different color measuring needs and requirement of the users ensuring precision and accuracy across applications.
