What Is Metamerism?
The metamerism is simply the same color but different spectral composition. There is a certain relationship between the reproduction of a color and the characteristics of the light source in which the color is observed. A certain two substances appear the same color under one light source, but show different colors under another light source. This phenomenon is called the same color. Strange phenomenon.
Metamerism
Right!
- Chinese name
- Metamerism
- Affiliation
- Optical phenomenon
- Overview
- Same color but different spectral composition
- Use
- Packaging anti-counterfeiting printing field
- The metamerism is simply the same color but different spectral composition. There is a certain relationship between the reproduction of a color and the characteristics of the light source in which the color is observed. A certain two substances appear the same color under one light source, but show different colors under another light source. This phenomenon is called the same color. Strange phenomenon.
- Phenomenon 1: In real life, when shopping in a mall or a supermarket, socks or gloves with the same color under fluorescent lights are different under incandescent lights after they are bought home.
- Phenomenon 2: In color printing, it is obtained during trial printing
- First, according to the different spectral characteristics of the ink, the spectra of these two inks are measured by an instrument for comparison and identification. The second is based on the principle of selective absorption and reflection of light by the ink, and observation through specific color filters. One ink changes the reflected light due to the role of the color filter, while the other ink still absorbs and reflects the original The color of the light did not change.
- Since metamer images are specially designed for the human eye and not for the reproduction system, the printing method of metamer ink is not special. The printing of metamerism ink is mostly offset printing, which can be used for color separation printing or normal printing. The two inks should be printed on the adjacent parts of the substrate to facilitate observation and comparison.
- Metamerism inks can also be combined with infrared inks for better anti-counterfeiting effects. The characteristic of this application is that under the illumination of the wavelength of 600-1000mm, the visual effects of the two inks are the same, and under infrared light, the two inks have different colors and different spectral characteristics, which can achieve double security. efficacy. For example, when printing, you can use infrared invisible ink to cover the infrared visible barcode. In this way, the human eye can only see the visible color blocks and not the barcode, and the barcode under the ink overlay can be scanned by near infrared barcode. Instrument reads. The overwritten barcode cannot be copied during copying, so it cannot be forged. As another example, we can use a type of infrared invisible ink to cover the green pixel printing design. Under daylight illumination, the green pixel is not visible. Observe this print through a red or magenta filter. The green pixels are black because the filter absorbs green light. The red image is brightened by the red light passing through the filter. The contrast between the foreground and background colors is highlighted.