Inkjet Printers Linearization Using 3D Gradation Curves
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An inkjet printers linearization using 3D gradation curves Oleg MILDER, PhD, IRIT UrFU, Ekaterinburg Dmitry TARASOV, IRIT UrFU , Ekaterinburg Marina Titova, IRIT UrFU , Ekaterinburg [email protected]
Transcript of Inkjet Printers Linearization Using 3D Gradation Curves
An inkjet printers linearization using 3D
gradation curves
Oleg MILDER, PhD, IRIT UrFU, Ekaterinburg Dmitry TARASOV, IRIT UrFU , Ekaterinburg
Marina Titova, IRIT UrFU , [email protected]
Color is how the reflectivity of an object is realized, taking into account its illumination and observing.
Color is a three-dimensional vector value.
Synthesis of a color is the process of obtaining a given color from the set of available ones.
Color
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Lab space is a non-linear, "equally contrast" color coordinate space
Lab-coordinated
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«Classical» gradation curves
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Linearization is a special configuration of the printer, which is responsible for supplying the ink in the required quantity.
Aim of the work: demonstration of the possibilities of gradation trajectories applied to the problems of linearization of inkjet digital printing systems.
Objectives: 1. To determine the criterion for limiting the ink supply in inkjet printing, based on the interaction of the ink and the substrate.
2. To determine experimentally the numerical value of the maximum ink feed
3. To present a linearization algorithm using gradation trajectories
Aims and objectives
Gradation Trajectory We will refer to the locus of
points in the Lab space, whose coordinates correspond to the measurement results of the individual gradation scale fields located in the order of the percentage of filling the raster cell in the layout from 0% (unprinted substrate) to 100% (die).
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trajectoryGradation ),,()(
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Gradation trajectory, curvature and torsion
The experimentPrinter: Mimaki CJV30-160BSPrint mode: 720×720 variable dotPaper: MediaPrintGloss 150 г/м2.Chart generation: ChartGenerator MeasureTool ProfileMakerMeasurement: i1 iSisMathematical processing: MS Excel, MatLab
Saturation and color diagram (ab) for Cyan
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saturation
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Gradation trajectory for Magenta, its Curvature and Torsion
Comparison of experimental data
Criterion for limiting
the ink supply
C M Y
0,95Сmax 60% 74% 78%Maximum curvature 75,5% 95% 91%Difference
E76 7,3 4,8 3,9
The result of linearization
Fill in the layout
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al g
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ness
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Algorithm of linearization using gradation trajectories
Printing and tone scale measurement
The construction of a gradation trajectory and finding the maximum of
curvature
Linearization by the selected parameter
ConclisionsGradational trajectories can be used as a replacement for traditional gradation curves when colorizing inkjet printing systems
Gradation trajectories make it possible to calculate the optimum maximum ink supply percentage by a certain criterion (maximum curvature, for example)
Gradational trajectories are invariant for a given "substrate-ink" pair
The process of linearization using gradation trajectories reduces to the displacement of points corresponding to the Lab coordinates of the target raster fields along the trajectory. The nature of the displacement depends on the parameter by which the linearization is carried out
Thanks for the attention!
An inkjet printers linearization using 3D gradation curves
Oleg MILDERDmitry TARASOV
