Introduction to the classification and principle of common color difference meter for cigarette package printing
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Color difference meter classification
According to the performance parameters, accuracy range and usage requirements, the color difference meter can be divided into three types: the first one is a hand-held color difference meter, also known as a color color difference meter, which can directly read data without connecting to a computer, without software, easy to use. The price is cheap, but the precision is low, and it is widely used in the general field of color management. The second type is a portable colorimeter, also known as a portable spectrophotometer, which can be connected to a computer in addition to reading data directly. The software is small in size, easy to carry, high in precision and moderate in price. The third type is a desktop colorimeter, also known as a desktop spectrophotometer, which has a reading window. When connecting to a computer, it needs to use color measurement and color matching software. High-precision color measurement and color matching function, large size, stable performance and high price. At present, the domestic printing companies use a wide range of portable colorimeter.
Principle of color difference meter
The color difference meter is an optical measuring instrument that simulates the red, green and blue light sensing of the human eye. It can perform five-angle analysis on the measured object, and it is customary to select the angles of 15°, 45° and 110° for analysis. All colors can be sensed and measured by any kind of Lab color ruler. The L axis is the brightness axis, 0 is black, 100 is white; the a axis is red and green axis, positive value is red, negative is green, 0 is Neutral color; b-axis is yellow-blue axis, positive value is yellow, negative value is blue, and 0 is neutral color. These scales can be used to indicate the color difference between the sample and the standard. Usually, Δa, Δb, and ΔL are used as identifiers. ΔE is defined as the total color difference of the sample, but it cannot indicate the deviation direction of the sample color difference, ΔE value. The larger, the larger the color difference. The color difference meter can measure the color difference ΔE and Δa, Δb, ΔL values ​​of the sample and the standard according to the Lab and Lch principles of the CIE chromaticity space. ΔE is usually calculated as follows: ΔE*=[(ΔL*)2+(Δa*)2+(Δb*)2]1/2 Sometimes some companies will require a total color difference of less than 2, and some will also require a Lab value. . If ΔE ≤ 2.0, it is recommended that Δa, Δb, ΔL are all ≤ 1.5, and generally ΔE is 1.5 when the visual discretion is discernible. Since Δa, Δb, and ΔL are generally not fixed, in the case where the requirements are too strict, the total color difference ΔE and the color difference Δc (regardless of the brightness effect) are often required. In this case, the following formula can be calculated: ΔE* =[(ΔL*)2+(Δa*)2+(Δb*)2]1/2Δc*=[(Δa*)2+(Δb*)2]1/2.
The above content is selected from the 8th issue of “ Printing Technology·Packaging and Decoration †of Keyin Media in 2013. For more journal content, please pay attention to the journal channel, and click on the latest journal content to enter the electronic journal channel of Keyin.com.
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