Setting Tolerances for Color Control 11

An example showing the ∆E for the L*a*b* color system. Photo courtesy of BYK-Gardner.

An example showing the ∆E for the L*a*b* color system.
Photo courtesy of BYK-Gardner.

A well-known, if extremely rough, convention in the world of color measurement says that in CIEL*a*b* or CIEL*C*h space, a dE* value of less than one indicates that two colors are visually indistinguishable to the human eye. The reality is far more complex than this. The limits of visual perception actually differ depending upon which portion of color space is being discussed.

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Controlling the Tight Color and Gloss Tolerances of Automotive Interior Parts 5

Measuring color for an interior automotive application with a spectra-guide-S. Photo courtesy of BYK-Gardner.

Measuring color for an interior automotive application with a spectra-guide-S.
Photo courtesy of BYK-Gardner.

Automotive Interiors

Automotive interiors are comprised of a variety of materials and produced by several companies. To achieve a uniform appearance, automotive companies have tight quality control (QC) tolerances. Color tolerances are typically ­±0.5 for ΔL*, Δa*, Δb* and gloss tolerances are typically ±0.3 to 0.5 gloss units (GU).

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