In addition, since the hiding power of the pigments is not sufficient, a higher pigment amount is needed in the formula to reach the demands of the OEM specification. The pigments used for high chromatic colors are much more expensive and often show a lower weather stability. On the other hand, these colors are very difficult to handle from the technical point of view. The color and the shape of a vehicle are the first things we detect and a high chromatic candylike looking color is often used when presenting a new car model. A new high chromatic color on the street is immediately catching the eye. On the one hand, it is obvious that these vivid colors are special which is why OEM designers are always on search for them. High chromatic colors in the automotive industry are a challenging topic despite allowing larger tolerances. The ellipses are also longer in the chromatic direction and narrower in the hue direction: this means the human eye accepts more deviation in Chroma than in Hue.įigure 5: Pearl colors measured with BYK-mac i (only 15° angle and 110° angle are presented)ĭaily challenges of high chromatic OEM colors The so-called tolerance ellipses (figure 2) are smaller and more “spherical” when closer to the achromatic midpoint and wider when the color turns more into the chromatic direction on the outer lines. The fact that we accept more color deviation in colors with higher C*-values than color deviations in color areas with lower C*-values was already examined in the beginning of the last century by visual assessment tests of David MacAdam and later further developed by the International Commission on Illumination (CIE Commission internationale de l’éclairage). Scientists saw a need in differentiating both color types - chromatic and achromatic– to create color tolerances which fit best to our visual perception. Our eyes are much more tolerant when comparing colors in chromatic areas than for example in the grey area. Our visual acceptance for color differences changes dramatically from chromatic to achromatic / pastel-like colors. In total we can detect more than 10 million colors.Ĭolors are separated in chromatic and achromatic colors Color became a new advantage for surviving.Ī healthy human eye nowadays can see many different color shades, from yellow to violet with different saturations and lightness levels. The evolution of these cells began, when primates switched their activities from night to daytime and began to search for ripe fruits and different kind of plants. The human perception of color is possible as the eye developed additionally to the light sensitive rod cells some new specialized retinal cells – the so-called cone cells. Daily challenges of high chromatic OEM colors.Colors are separated in chromatic and achromatic colors.Figure 1: With color the ripe oranges can be seen from far away (picture: pixabay)
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