Effect of Adjacent Color on Sample Measured Color

The author presented a paper 1 at the 2000 TAGA annual meeting which demonstrated that colored areas adjacent to a white sample area can affect the measured value of the sample area. This paper reports on an extension of the previous work. Using samples prepared with improved techniques, the methods used in the previous paper have been refined and the differences caused by making measurements of the samples with both white and black backing have been determined. Also, the effects of replacing the white central area with other colors and/or reducing the saturation of the colors are reported. Results of another set of experiments show that the instrument position within the central area affects the measured color. Finally, it is shown that on occasion the color of the instrument aperture plate, which is placed against the sample while the measurement is being made, can affect the measured color.