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Color Evaluation in the Coil Coating Industry

Quantifying the color of an object, and then measuring color difference between the object’s color and a color standard, is an important factor in assuring color consistency and acceptance. Assembling parts from various lots and production runs requires that parts have minimal—or no—color difference, so a typical observer sees nothing objectionable.

Typically, a color instrument will deliver color values represented by three color coordinates:

  • “L” value, which describes the lightness or darkness of a sample
  • “a” value, which describes the redness or greenness of a sample
  • “b” value, which describes the yellowness or blueness of a sample
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NCCA Color Experiment at NCCA’s Fall Meeting and METALCON 2017

NCCA has been investigating an alternative method for color measurement for the coil coating industry. As part of this investigation, NCCA is coordinating a visual assessment experiment. In a nutshell, we are attempting to assess the human response to slight color differences between pairs of panels and to correlate that response to a color instrument’s reading. Of course, people see color and color differences differently, and color instruments have a host of setup options from which to choose, so this is hardly a straightforward experiment. But if it were simple, it would have been done decades ago. Continue reading