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Lowes color match painnt9/3/2023 "Spectrophotometer is used to match paint with color samples.", September, 2008.Choosing Paint Colors: Decoding the DisplayĪ variety of stores give paint samples, either free or at a ridiculously low price. "Spectrophotometers and the Standard Curve." Southwestern College, Chula Vista, CA, 2009." How does a spectrophotometer work?" Bronx High School of Science, August 1997. "Color Matching: Does It Really Work?" House Beautiful, 2009. "How to Ensure Effective Color in Today's Manufacturing Processes.", May 2005. "Environmental sampling and analysis lab manual." CRC Press, 1999. "Color Spectrophotometers: Meeting Manufacturers' Needs.", November, 1999.If there were 100 interference filters, but the computer could only read 15 of them, the information from the highly functioning machine wouldn't be interpreted as accurately. Computer software also determines accuracy. The smaller amounts you can break the wavelengths into to measure, the better. Spectrophotometers typically have between 16 and 31 filters, with 31 being the most accurate. Typically, color matching is about 90 percent accurate, and accuracy really depends on the model of spectrophotometer and the computer software that goes with it. These newer models use LED lights that project a hot, strong beam of light that easily reaches the sample while also rejecting ambient light in the room, which can get in the way of an accurate reading. Older models of spectrophotometers are limited to samples that can fit in the little clip attached to the machine, but newer models have developed technology that doesn't require the sample to be in contact with the machine, so you could bring in a lamp or a door. The photo diode converts the information to an electronic signal, which is then sent to computer software that formulates the exact amount of pigments needed to make the match. The wavelength representing the correct color match passes through the correct filter and is then picked up with fiber optics and piped to a photo diode. This increases the accuracy of matching the sample because absorption can interfere with readings. Nowadays, spectrophotometers in paint matching use interference filters, where only the color of the sample reaches the filters - all other wavelengths are reflected away. The apple will absorb all of the other colors, but will reflect red back to you. An example of this is if you were to shine a white light on a red apple. Seth Joel/Photographer's Choice/ Getty ImagesĮarlier spectrophotometers used transmission filters, which meant the wavelength that matched the color sample would be reflected through the filter, and all of the other wavelengths would be absorbed. The visible light spectrum ranges from the reds at 400 nm to the blues in the 700nm range, and the most efficient wheels have filters that handle intervals of 10 nm each. Each filter is programmed to allow a specific wavelength of light to pass through it, and each wavelength is within a particular range of nanometers. Visible light is measured in nanometers, which is a tiny unit of measurement in the metric system, equal to one-billionth of a meter. The wheel is a highly efficient color analyzer, consisting of a number of interference filters and powered by a stepper motor, which is known for its precision. This light is reflected off the sample back into the machine and onto a small wheel. A clip located on the outside of the machine holds the paint sample to be matched, and white light is flooded onto the sample.
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