Discussion on the influence of ink layer thickness on color rendering effect (1)
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
For the same color mixture, when the thickness or the brightness of the illumination source changes, the hue, brightness, and saturation change. In this paper, through the experimental study of the change of pigment concentration (thickness), the coloration phenomenon of the same ink at different thicknesses is analyzed to investigate the effect of the thickness of the ink layer on the coloration effect.
Color mixing, inter-color, chromaticity diagram
For the same ink, the color properties may change when the thickness of the ink layer changes, which may have a certain effect on the reproduction of the printed color, especially the spot color control of screen printing. The change of the thickness of the ink layer has different effects on the color rendering effect of the primary color, the intermediate color and the complex color ink. The two color materials are often darker after mixing, and exhibit a dark color or even a black color with a certain color tendency. How to explain the phenomenon of color mixing and coloring, and the regularity of color mixing and coloring are all worthy of further discussion.
1. The coloration of the same ink layer thickness changes
The same color of the intermediate color red ink and the green ink are separately mixed, and the mixed ink is sampled by the Dutch IGT C1 type printability meter (the ink is unchanged, only the amount of ink is changed), and the same ink is printed. Color samples of different ink layer thicknesses. The thickness of the ink layer is determined by analyzing the balance of the pre-press and post-press printing discs. Test data for color when the thickness of the ink layer changes after mixing different inks, their hue and saturation are reflected on the CIE xy chromaticity diagram
Note: First mix the ink, use the Dutch IGT C1 printing suitability instrument to make a small sample of the mixed ink (ink does not change, only change the amount of ink, the unit of ink is ml), get the same ink printing A color sample of the thickness of the ink layer. The data was measured using an SC-1 intelligent colorimeter. The ink used is the Tiens brand.
When the thickness of the ink layer is reduced, the hue of the yellow (primary color) changes little, the brightness is slightly increased, the saturation is lowered; the red + green (inter-color mixing), the hue is from black to purple (theoretically should be yellow-gray, due to The color change of the ink becomes purple-red), the brightness increases rapidly, and the change of saturation is different from other color materials. When the ink layer is thick (the ink volume is 1.2ml and the ink layer thickness is about 6.5mm), the saturation is higher. Small (x=0.3244, y=0.2961), as the thickness of the ink layer decreases, the saturation gradually increases, and after a certain amount (x=0.3589, y=0.2627), it begins to decrease again; red+yellow (inter-color and non-color) The complementary color primary color material is mixed. As the thickness of the ink layer decreases, the hue changes from red (x=0.6002, y=0.3482) to red-yellow, the brightness increases, and the saturation decreases rapidly.
Considering that the nature of the selective absorption of light by the reflecting object and the transmitting object is similar, the above phenomenon is explained by the absorption and transmission of incident light during the ideal color filter lamination process.