Second, the principle of color

1. The mixing of colors is a process of color reduction. The more colors are added, the more shades of color are subtracted, and the darker they appear. For this reason, it is preferable to use three primary colors or basic colors when matching colors. There are 1330 kinds of colors that can be allocated with the three primary colors. If you add black, you can get as many as 14640 kinds, that is, almost all colors can be adjusted. For example, the color on the PANTON color card. The mixing rules for the three primary colors of pigments are:

Magenta + yellow = red

Yellow + blue = green

Magenta + blue = blue

The primary colors are added together, and equal amounts of yellow, magenta, and green phases are added in black.

The mixing rule for the equal amount of inter-color and inter-color is:

Red + Green = Red Green (yellow grey)

Green + Blue = Green Blue (Cyan)

Blue + Red = Blue Red (red-gray)

2. In the color cards of various brands of ink, all are marked with the three primary colors, basic colors, and standard colors. When color matching, why use three primary colors or basic colors instead of standard colors? This is because the three primary colors and the basic colors are composed of a single pigment, and the standard colors are the basic colors. Each of the standard colors is derived from two or more pigments, and the colors formed by the standard colors cannot Satisfies the 3 attributes of the color. That is, the hue, brightness and purity are not as good as those of the three primary colors or the basic colors. The more gray and dark the color is, the older the color is, and the less vivid it is.

(1) Hue: It reflects the inherent color appearance of color, and is the main difference between color and color. That is, a certain wavelength of light represents a certain fixed hue. The hue is different, and the wavelength of the light wave is also different. The color measurement is represented by H.

(2) Brightness: Reflects lightness and darkness. There are two kinds of brightness for color, one is the degree of lightness and darkness between each color. This is due to the different wavelengths of light waves of different colors. After reflection, the degree of stimulation to the human eye depends on the tennis film. From the green to the entire visible spectrum, Yellow is the highest and lightness is high, so people are very sensitive to green, from orange to red, green to purple, the brightness decreases; the other is the color of the same hue, the height is different, that is, they appear to be deep between them or due to different brightness. There are shallow, the more white, the greater the brightness.

(3) Purity (saturation): It reflects the degree of color close to natural color. The closer to natural color, the higher the purity, and vice versa. In the measurement of computer color separation, it is represented by C.

Third, the color steps

When you get a sample (sample), you should do it from the following steps:

1. According to the material of the substrate, determine which type of ink to use and then select the brand of ink.

2. According to the sample draft, first select the main color, the main color is selected, then see what color, that is, the secondary color.

3. Color Matching: Remove the main color after thorough mixing and then add the secondary color. In the addition of the secondary color, be careful, add a little bit more, and then use the same parameter when the color of the deployment is close to the sample. The mesh number, the same screen thickness as the photosensitive layer, and the same scratch hardness, etc.) were tested until it passed.

4 ink sample preparation process method points:

(1) Analyze the sample, determine the main color and sub-color (color head), select the ink with the percentage of a certain weight with the reference color (three primary colors).

(2) In the color matching process, the principles of light and dark (white, yellow, orange, red, purple, blue, cyan, green, and black) are used. In particular, colors with strong coloring power can only be added to quantitative 70% to 80%. When the hue is close, it should be added with care and accurately weighed. The main color is added in 100 g units and the secondary colors are weighed in 0.1 g accuracy.