5 results about "Dot gain" patented technology

The invention discloses a printing color closed-loop control system based on spectral analysis, and relates to the technical field of computer processing, and the system comprises the following steps: S01, collecting the spectral reflectivity data of a plurality of key color blocks on a printed matter measurement and control strip in real time through an online high-speed spectrometer at the frequency of not less than 100 color blocks per second; s02, constructing a color prediction model, wherein the model receives the spectral reflectivity data and outputs absorption scattering characteristics, the spectral transmittance of ink and dot expansion, trapping and overprinting effects in the printing process; s03, setting a dynamic tolerance threshold value delta Et based on a chromatic aberration formula according to the color precision requirement of the printed matter, and judging the absorption and scattering characteristics, the spectral transmittance of the ink and a grading tolerance interval in which the dot expansion, trapping and overprinting effects in the printing process are consistent with visual perception; and S04, converting the spectral reflectivity data acquired in real time into a CIELAB color space irrelevant to equipment, and comparing the spectral reflectivity data with a preset standard color target value. According to the method, the problems of different standards and color drift caused by artificial experience difference and visual fatigue are solved.

The present application discloses a method for spectral prediction and closed-loop feedback wide-width corrugated box extended gamut flexographic pre-printing, belonging to the field of packaging engineering and printing technology. The method comprises: establishing a dot gain mapping function based on the Yule-Nielsen correction model by testing the roughness, ink absorption and surface energy of the corrugated paper; printing a CMYKOGV seven-color characteristic color card to generate an adaptive ICC profile; using the CIEDE2000 color difference formula and constant hue angle mapping algorithm for gamut compression and color separation; selecting a low-hardness flat-top dot flexographic plate and configuring a anisotropic screen roller; introducing the Walker-Fetsko rheological ink transfer equation during printing, combining with real-time feedback of an online spectrophotometer to dynamically adjust the printing pressure and ink viscosity, and realizing closed-loop compensation. The present application realizes high-precision simulation of more than 90% of the PANTONE spot color library, completely gets rid of the dependence on spot colors, significantly improves the color stability and production efficiency of wide-width flexographic printing, and is suitable for extended gamut pre-printing production of high-quality corrugated boxes.

The present invention relates to a method for producing halftone contract proofs using plotter-printed proofs with a combination of hybrid and non-hybrid screens for subsequent flexographic printing. This allows AM, FM, and XM screens to be combined in the proof without distortion, and allows the parameters defining plotter printing to be automatically incorporated into different machines capable of performing such printing. The method consists of 15 steps, in which specific hybrid screens are generated for halftone plotter proofs using correction curves and minimum values ​​different from those used for flexographic cliché printing, and the information required for automating the process is incorporated in files and databases in a standardized manner by modifying the dot gain settings on the color profile.

The application discloses a kind of CTP plate making quality detection analysis method based on image recognition technical field, it is related to the field of image recognition CTP plate making quality detection, including: using high-resolution image acquisition equipment Synchronous acquisition has been made CTP plate image and the printed matter image produced by the plate;With the geometric center outside the effective printing area of plate and corner point as physical reference mark, a unified coordinate system is constructed, and feature positioning and area division are carried out based on the unified coordinate system;By extracting multi-dimensional feature data such as dot gain and dirty dot coverage, generate deviation data set, and combine feature type and position relationship to carry out combined logic analysis to determine the reason of dot overexpansion and the root cause of dirty dot generation, realize the automatic detection and root cause tracing of CTP plate making quality, improve the detection efficiency.

The invention relates to an image processing method, circuit and device, electronic equipment and a chip, and the method comprises the steps: obtaining a to-be-processed original image, and obtaining a standard white point gain, a preference white point gain and a light source parameter; carrying out white balance correction on the original image by adopting a standard white point gain, and carrying out color correction on a white balance image obtained by white balance processing according to the light source parameters to obtain a color correction image; and performing color adaptation transformation processing on the color correction image according to the standard white dot gain and the preference white dot gain to obtain a target image. According to the invention, the standard white point gain is combined with the light source parameters to carry out white balance and color correction, the physical accuracy of image color restoration is guaranteed, the preference white point gain and the standard white point gain are introduced to carry out color adaptation transformation, stylized rendering conforming to the visual preference of human eyes is realized, and the image quality is improved. The interference on color correction based on preference white point gain in the prior art is effectively solved, and the color fidelity, stability and style flexibility of an imaging system are improved.