Metamerism
Variations in color perceived under different light, surrounding colors, or by the observer's sense of color. http://en.wikipedia.org/wiki/Metamerism_(color)
Metamerism
Metamerism is a term used in the textile industry to describe the phenomenon of color matching under one set of lighting conditions, but appearing different when viewed under another set of lighting conditions. It occurs when two colors appear to match under one type of light, but appear different under another type of light. Metamerism is a common problem in textile color matching, and can cause color inconsistencies in the final product.
Metamerism is caused by differences in the spectral power distribution of different light sources. The human eye has three types of color receptors, each sensitive to different parts of the visible spectrum. When a colored object is viewed under a certain type of light, these receptors are stimulated in a certain way, resulting in the perception of a certain color. However, if the spectral power distribution of the light changes, the receptors may be stimulated differently, resulting in a different perceived color.
In the textile industry, metamerism is a common problem when matching colors of different fabrics or dyes. Different fibers and dyes absorb and reflect light differently, and as a result, the colors may appear different under different lighting conditions. The problem is exacerbated by the fact that different types of lighting are used in different stages of textile production, such as natural light during fabric inspection, fluorescent light in the dyeing stage, and incandescent light during the final product inspection.
To overcome the problem of metamerism, textile manufacturers use color measurement instruments such as spectrophotometers to measure the spectral reflectance of the fabric under different lighting conditions. This enables them to identify the exact color of the fabric and match it to a standard color under different lighting conditions. Color matching software is also used to simulate the appearance of the fabric under different lighting conditions, allowing manufacturers to predict the metamerism problem and adjust the dye formulations accordingly.
Metamerism is also a problem in other industries, such as paint, cosmetics, and plastics. In paint, for example, different pigments may appear different under different lighting conditions, resulting in color inconsistencies in the final product. To overcome this problem, paint manufacturers use color matching software and instruments to measure the spectral reflectance of the paint under different lighting conditions, and adjust the pigment formulations accordingly.
In conclusion, metamerism is a common problem in the textile industry, and can cause color inconsistencies in the final product. It is caused by differences in the spectral power distribution of different light sources, and can be overcome by using color measurement instruments and color matching software to adjust the dye formulations and predict the appearance of the fabric under different lighting conditions. With the advances in technology and the availability of color measurement instruments, the problem of metamerism can be minimized, resulting in more accurate and consistent color matching in the textile industry.
Metamerism
A metamerism occurs when the color standard and the submit do not match under all lighting conditions. This means that a solid color fabric when viewed under two different lights in a commercial light box, will appear to cast two different colors. The correct technical definition for metamerism is a conditional match that is, two or more samples match for one observer under one light source, but not under a different light source for that same observer.
Metamerism
A marked change in the colour of an object with a change in the spectral composition of the light by which it is viewed.
NOTE:
Metamerism can be judged only with reference to the changes occurring in other objects in the fields of view as the illumination is changed.