Figure 1 The color appearance of the ink layer of two mixed colors (red + green) when the thickness of the ink changes
Figure 2a The color appearance of the same ink when the thickness of the ink layer changes
Figure 2b The color appearance of the mixed ink of two different colors (red + green) when the thickness of the ink layer changes
Figure 2c Color rendering when the thickness of the mixed ink layer of primary and non-complementary colorants (red + yellow) changes
Figure 2d The color of the primary color material (yellow) when the thickness of the ink layer changes
As can be seen from Table 1 and Figures 2a ~ d, when the thickness of the ink layer decreases, the hue of the yellow (primary color) changes less, the lightness increases slightly, and the saturation decreases (see Figure 2d); red + green (intercolor) Mixed), the hue changes from black to magenta (theoretically should be yellow-gray, which becomes purple-red due to the color shift of the ink), the brightness increases rapidly, the change in saturation is different from other colors, and the ink layer is thicker (ink When the amount is 1.2ml and the ink layer thickness is about 6.5mm, the saturation is small (x = 0.3244, y = 0.2961). As the thickness of the ink layer decreases, the saturation gradually increases to a certain amount (x = 0.3589, y = 0.2627) and then began to decrease (as shown in Figure 2b); red + yellow (intercolor and non-complementary primary color mixture), as the thickness of the ink layer decreases, the hue changes from red (x = 0.6002, y = 0.3482) changes to red and yellow (as shown in Figure 2c), the brightness increases, and the saturation decreases rapidly.
Considering that the nature of selective absorption of light by reflective objects and transmissive objects is similar, the above phenomenon is explained by the absorption and transmission of incident light during the superposition of ideal color filters.
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