Effect of Paper’s Spectral Reflectance on the Printing’s Dot Gain

2011 ◽  
Vol 236-238 ◽  
pp. 1246-1249
Author(s):  
Chen Fei Zhao ◽  
Qing Han
Keyword(s):  
Spectral Reflectance ◽  
Color Patch ◽  
Color Reproduction ◽  
Print Material ◽  
Printing Quality ◽  
Dot Gain ◽  
Light Color ◽  
Area Percentage

Paper is the main print material, whose performance is a factor that effects the printing’s dot gain which is bad to image clarity and color reproduction. In the paper, Yule-Nielsen neugebauer spectral modal is analyzed , and the relation between paper’s spectral reflectance and the printing’s dot gain is discussed. By experiments, the paper’s spectral reflectance is adopted as correction index, which can reduce the dot gain value of the light color patch , and in the same printing conditions the dot gain is effected by the paper’s spectral reflectance, ink’s type, dot area percentage and wavelengths. The research has a certain significance for controlling printing quality and reducing the producing cost.

Effective Dot Area’s Calculating Based on YNSN Model

2012 ◽  
Vol 262 ◽  
pp. 40-43
Author(s):  
Chen Fei Zhao ◽  
Qing Han ◽  
Cong Cong Chi ◽  
Qing Jun Meng
Keyword(s):  
Visible Light ◽  
Spectral Reflectance ◽  
Dot Gain ◽  
Light Color

Yule-Nielsen neugebauer spectrum(YNSN) model can describe the relation between dot area and spectrum reflectance, which can calculate the effective dot area. The modified index in the model still can’t be determined. The reciprocal of paper’s spectral reflectance at the range of visible light is adopted as the modified index in YNSN model in order to reduce the optical dot gain. By experiment, the modified YNSN mode can be used to calculate the effective dot area of light color. The research has a certain significance for controlling and testing printing color.

Correcting Prediction Model of Printing’s Dot Area by the Spectral Reflectance

2011 ◽  
Vol 287-290 ◽  
pp. 124-127
Author(s):  
Chen Fei Zhao ◽  
Qing Han ◽  
Xiao Li Wen
Keyword(s):  
Prediction Model ◽  
Spectral Reflectance ◽  
Color Patch ◽  
Printing Quality ◽  
Dark Color

Yule-Nielsen spectral neugebauer (YNSN) model is widely used in printing for predicting dot area. The model’s accuracy is effected by the paper’s performance, ink kinds, wavelengths, and printing conditions. In the paper, the relation between the solid color patch’s spectral reflectance and the printing’s dark dot area is discussed. By experiments, the solid color patch’s spectral reflectance is adopted as fixed index of YNSN model, which can reduce the deviation of the dark color patch. The research has a certain significance for controlling printing quality and reducing the producing cost.

Parameter Study of Offset Press Cylinder Based on Sliding Friction

2010 ◽  
Vol 174 ◽  
pp. 299-302 ◽  
Author(s):  
Hai Yan Zhang ◽  
He Ping Hou ◽  
Jun Feng Si ◽  
Xiao Yu Chen
Keyword(s):  
Contact Area ◽  
Sliding Friction ◽  
Accurate Determination ◽  
Rolling Process ◽  
Elastic Cylinder ◽  
Parameter Study ◽  
Cylinder Radius ◽  
Printing Quality ◽  
Dot Gain

In the contact area of offset, a relative slide occurs between the surface of plate cylinder and blanket cylinder, which changes the print image and influences the printing quality. The relative slide in the cylinders’ rolling process is investigated, and the determination rule of cylinders’ geometric parameters of offset press is proposed. The results show that the relative slide is minimization under the condition that the compression of elastic cylinder radius is 0.2 times bigger than that of rigid cylinder radius, and the deformation of print image and dot gain both are minimization. The results provide theoretical direction for accurate determination of cylinder radius of offset press.

A Study of Color Variance between Vacuum Plate of Aluminum and Aluminum Foil Using UV Offset Printing

2012 ◽  
Vol 262 ◽  
pp. 253-257
Author(s):  
Chang Lang Chen ◽  
Mei Chun Lo ◽  
Ming Chw Wei ◽  
Shi Wei Wang
Keyword(s):  
Aluminum Foil ◽  
Packaging Materials ◽  
Offset Printing ◽  
Color Gamut ◽  
Test Form ◽  
White Board ◽  
Printing Quality ◽  
Dot Gain ◽  
Green Packaging ◽  
The Difference

In packaging market, Vacuum Plate of Aluminum by UV offset printing is light impediment effectively, moisture-proof, and forgery-proof and reaches the request of the green packaging production. Thus, the packaging of Vacuum Plate of Aluminum is used widely. This study was a true experimental research. The test form employed was the printing quality control strip from international printing specification. It was used to record and analyze the color variance between Vacuum Plate of Aluminum and Aluminum Foil with white board and no white board using UV Offset Printing. The study indicated the comparison of Tone Value Increased & the difference of Color Gamut Range among these three packaging materials via C, M, Y, K four colors tone value and RGB area testing, and results reveals that the tone value on the Vacuum Plate of Aluminum with white board increased most among these three materials; the dot gain percentage of the Vacuum Plate of Aluminum is less than 15% which with the highest stability than others. All signature findings are given in Fig.1 and Fig.2. These results are entirely consistent with research hypotheses.

A Novel Method to Qualify the Status of Printing Process Rapidly

2010 ◽  
Vol 174 ◽  
pp. 203-206 ◽  
Author(s):  
Ying Wang ◽  
Hao Xue Liu ◽  
Min Huang
Keyword(s):  
Test Results ◽  
Single Test ◽  
Test Sheet ◽  
Solid Density ◽  
Printing Quality ◽  
Dot Gain ◽  
The Status ◽  
Density Values ◽  
Novel Method ◽  
Printing Ink

According to the characteristics of ink feeding and printing quality control principles, a new test sheet was designed for qualifying press state and the test results were discussed in this paper. This test sheet was printed under the condition that printing ink volume for different ink zone is identical. Solid density, dot gain and print contrast of different printing ink volume were simulated on a single test sheet, and thus the optimal printing status can be determined quickly. Experiment results show that this method is accessible, economic, and rapid. The optimum solid density values can be got easily for all primary colors on a single test sheet. This method is suit for the adjustment of printing status.

Printing Performance of Different Pigment Coated Paper

2012 ◽  
Vol 549 ◽  
pp. 601-604
Author(s):  
Yan Zhang ◽  
Tie Qing Su
Keyword(s):  
Surface Chemistry ◽  
Print Quality ◽  
High Porosity ◽  
Color Reproduction ◽  
Coating Structure ◽  
Coated Paper ◽  
Paper Surface ◽  
Porosity Structure ◽  
Dot Gain

For high print quality, halftone dots should have minimal dot gain and sharp, circular edges, the receiving surface must have a line, high-porosity structure and be hydrophilic. Paper surface chemistry requirements for good inkjet print quality are so unconventional that new paper grades for printing should be specially designed. In this paper, the printability, coating structure and the color reproduction after printing of coated paper was studied.

Color reproduction based on spectral reflectance

1999 ◽  
Author(s):  
Eul H. Lee ◽  
Suk C. Ahn ◽  
Jae H. Kim
Keyword(s):  
Spectral Reflectance ◽  
Color Reproduction

Research on the Method of Determining the Optimum Parameters for Offset Ink

2010 ◽  
Vol 174 ◽  
pp. 255-258
Author(s):  
Wen Yan Jiang ◽  
Zhi Hong Wang
Keyword(s):  
Process Control ◽  
Experimental Method ◽  
Printing Process ◽  
Tone Reproduction ◽  
Optimum Parameters ◽  
Calibration Curves ◽  
Printing Quality ◽  
Dot Gain ◽  
Gain Compensation ◽  
The Relationship

By experimental method, the optimum parameters for offset ink were investigated under standard printing conditions. Firstly, the relationship between solid ink density and print contrast was established, and the optimum values of solid ink densities and print contrasts were calculated. Then, perfect tone reproduction was achieved by dot gain compensation, in which the calibration curves were obtained by the target curves and the initial tone value increase(TVI) curves based on optimum SIDs. The results showed that this method of determining the optimum parameters for offset inks were practicable and reliable, it can be used to research the printability of inks and papers, optimize printing process, improve printing quality, and provide method of standardization of process control for printing institutions.

Color reproduction of human skin by spectral reflectance using RGB images and the Wiener estimation method

2017 ◽  
Author(s):  
Kiyomi Sato ◽  
Shota Miyazawa ◽  
Hideki Funamizu ◽  
Tomonori Yuasa ◽  
Izumi Nishidate ◽  
...  
Keyword(s):  
Human Skin ◽  
Spectral Reflectance ◽  
Estimation Method ◽  
Color Reproduction ◽  
Wiener Estimation ◽  
Rgb Images

Research on the Impact of Surface Characteristic of Paper on Digital Printing Color Reproduction

2012 ◽  
Vol 549 ◽  
pp. 610-614
Author(s):  
Xue Lin Huang
Keyword(s):  
Surface Characteristics ◽  
Surface Characteristic ◽  
Digital Printing ◽  
Color Reproduction ◽  
Color Gamut ◽  
Printing Quality ◽  
Color Rendering ◽  
The Impact

The different paper has the different Surface Characteristic, which has the different influences on the printing color Reproduction. Through the paper printability, the color gamut experiments of digital printing, The influence of surface characteristics of paper on digital printing color reproduction was analyzed according to color rendering ability, The results indicated that the printed matter had better color efficiency, greater color gamut and smaller hue error and grayscale which had higher paper smoothness and glossiness, the higher paper whiteness is in favor of color reproduction. The surface characteristic of paper limits color reproduction. To ensure printing quality, should choose better color efficiency of paper.

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