To investigate the effect of the new car paint color assessment methods are mostly the effect of the current automotive topcoat paint, paint effect visual perception depends not only on the lighting conditions, but also on the viewing angle, for example: metallic paint will change with the viewing angle display changes in the light and dark known as: "light and dark transition." Pearl effect paint colors will decrease as the angle of incident light to produce color variations shut shop. Effect coating being in its "vitality" and a special attraction to become cars, home appliances and industrial equipment painting the protagonist. How objective assessment of the effect of paint colors, is the date of effect paints birth color will be placed in front of engineer problems. This study analyzed the current assessment of the effect of the coating method, combined with practical experience of the effects of paint colors and objective assessment methods were discussed. Visual assessment for monochromatic paint ordinary lighting conditions and closed environment to meet the requirement, but the effect of paint colors for visual assessment is concerned, this condition is obviously inadequate. Because the effect of paint except for the color, when direct light and flashing light will produce luster properties of the metal, with the change of the viewing angle, the color will change. When in the general standard light boxes observe testing, since the standard light source inside the front scattering plate for scattering of light without direct light, it can not be clearly observed the effect of metallic effect coatings. In addition. The sample is placed in a fixed standard light boxes, it must be observed in a relatively fixed angle. Otherwise observer height difference will directly affect the final results observed assessment. So the general standard light boxes have been difficult to meet the visual assessment of the effects of coating requirements. It describes the sensitivity of human color. Color in each ellipse, the human eye can not distinguish the difference, the human eye can feel the difference between color and oval oval. Meanwhile the same dark and light color, the sensitivity of the human eye is different different. In general, the human eye color tolerance for the color saturation is relatively large, color tolerance for color saturation small relatively small. 

keywords: To investigate the effect of the new car's paint color evaluation method,