In printing and publishing, advertising agencies, publishing houses, color separation departments, printing houses and suppliers widely use reflection densitometers for quality control in pre-press and printing operations. By measuring the ratio of the reflected light to the incident light (light source) of the red, green, and blue components of the light, the optical reflectivity (the amount and color of light reflected from the material, such as ink or dye) can be read directly. Based on these reflection values, the reflection densitometer can also calculate the main printing attributes, such as the main filter's solid density, contrast, dot gain / tone increase, color cast, and grayscale. The use of reflection densitometer in prepress department In the prepress department, reflection densitometers can be used to: • Measure the density of highlights, midtones, and dark tones for photos and artwork that are prepared for halftone reproduction. Measuring the brightest and darkest parts of these materials, the information obtained helps determine the amount of exposure that can produce an image on the printing plate that matches the range that can be achieved with a given ink, paper, and printing press conditions. • Specify the color and lighting range for the object to be photographed. This data can be used as a basis for adjustment by the layout staff or even the photographer in the photography studio to improve the final print. • Analyze the characteristics of proofing proofs to help control the changing factors of color and tone reproduction. • Analysis of purchased materials (such as ink and paper) for proofing and offline proofing. • Determine the coefficient of the mask. • Determine the characteristic curve of the emulsion (also called the sensitivity curve). The use of reflection density meter in printing workshop In the printing shop, the reflection density meter can be used for: • Analyze the quality of the offline proofing and printing proofs provided to determine whether they meet the standards or specifications. • Analyze the materials purchased in the printing shop (such as ink and paper). • Determine the performance of the printing press * (Note: The measurement during the printing process should be regarded as an instant situation in the printing operation, and adjustments should be made only when a clear trend is noticed. Short-term, periodic changes may be rubber The unstable performance of the cloth, or the reasons for the different batch numbers of ink and fountain solution, or various temporary factors. The long-term changes or drifts of the printed product may be changes in the absorption of the paper, the wear of the printing plate or Caused by the adjustment of the printing press, etc.). The density meter can be used to evaluate some properties of the printed matter, such as the color consistency between the printed sheet and the printed sheet; the color consistency from left to right on the printed sheet; the dot gain and the degree of blur; the thickness of the ink film; The degree to which the color matches the production printing. This information can be used as a basis for fault finding and statistical process control. Throughout the printing process, density meters allow printing professionals to communicate process information based on objective numbers and the necessary subjective and descriptive expressions. The numerical value is the key to facilitate communication of print quality and control of production process. For such uses, the density value must be based on a common definition, such as Status T.
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• Analyze the dot gain information on the signal bar, adjust the printing volume of the ink, monitor the consistency of the ink and fountain solution, and check the condition of the printing plate with the indicators of blocking and floating color.