PARAWACS: color halftoning with a single selector matrix

Morovic, Peter M.; Morovič, Ján; Gondek, Jay; Gaubatz, Matthew; Ulichney, Robert

doi:10.2352/issn.2169-2629.2017.32.41

Cited by 6 publications

(3 citation statements)

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“…But, as mentioned, if a cube is fitted to the surface of the JND sphere only 52.4% of the cube space is occupied by the sphere. Rather than fit the cube to the surface of the sphere past investigators decided to make the cube of identical volume as the sphere . However, this results in a degree of overlap of JND spheres in six regions of a sphere, as shown in Fig.…”

Section: Calculation Methodsmentioning

confidence: 99%

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How many object colors can we distinguish?

Kuehni

2015

Color Research & Application

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Section: Calculation Methodsmentioning

confidence: 99%

“…A JND sphere and the reference color in its center have in recent years been taken as representing one perceptible object color stimulus . But is this a logically solid concept or an unnecessarily limiting one?…”

Section: Key Factorsmentioning

confidence: 99%

How many object colors can we distinguish?

Kuehni

2015

Color Research & Application

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“…security printing, in which a different halftoning matrix should be applied to each colorant. A PARAWACS (Parallel Random Weighted Area Coverage Selection) method, an approach in which halftone matrices are applied to each channel, was thus proposed, offering a large degree of control over the binarization pattern (Morovič et al, 2016).…”

Section: Previous Workmentioning

confidence: 99%

Improving image quality in multi-channel printing - multilevel halftoning, color separation and graininess characterization

Elias¹

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Color printing is traditionally achieved by separating an input image into four channels (CMYK) and binarizing them using halftoning algorithms, in order to designate the locations of ink droplet placement. Multi-channel printing means a reproduction that employs additional inks other than these four in order to augment the color gamut (scope of reproducible colors) and reduce undesirable ink droplet visibility, so-called graininess.One aim of this dissertation has been to characterize a print setup in which both the primary inks CMYK and their light versions are used.The presented approach groups the inks, forming subsets, each representing a channel that is reproduced with multiple inks. To halftone the separated channels in the present methodology, a specific multilevel halftoning algorithm is employed, halftoning each channel to multiple levels. This algorithm performs the binarization from the ink subsets to each separate colorant. Consequently, the print characterization complexity remains unaltered when employing the light inks, avoiding the normal increase in computational complexity, the one-to-many mapping problem and the increase in the number of training samples. The results show that the reproduction is visually improved in terms of graininess and detail enhancement.The secondary color inks RGB are added in multi-channel printing to increase the color gamut. Utilizing them, however, potentially increases v the perceived graininess. Moreover, employing the primary, secondary and light inks means a color separation from a three-channel CIELAB space into a multi-channel colorant space, resulting in colorimetric redundancy in which multiple ink combinations can reproduce the same target color. To address this, a proposed cost function is incorporated in the color separation approach, weighting selected factors that influence the reproduced image quality, i.e. graininess and color accuracy, in order to select the optimal ink combination. The perceived graininess is modeled by employing S-CIELAB, a spatial low-pass filtering mimicking the human visual system. By applying the filtering to a large dataset, a generalized prediction that quantifies the perceived graininess is carried out and incorporated as a criterion in the color separation.Consequently, the presented research increases the understanding of color reproduction and image quality in multi-channel printing, provides concrete solutions to challenges in the practical implementation, and rises the possibilities to fully utilize the potential in multi-channel printing for superior image quality.

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From Gutenberg to Llamas: Print Optimization Through First Principles and AI

Morovič,

Morovič

2024

Lecture Notes in Computer Science

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PARAWACS: color halftoning with a single selector matrix

Cited by 6 publications

References 1 publication

How many object colors can we distinguish?

How many object colors can we distinguish?

Improving image quality in multi-channel printing - multilevel halftoning, color separation and graininess characterization

From Gutenberg to Llamas: Print Optimization Through First Principles and AI

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