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Printing with tonalli: Reproducing Featherwork from Precolonial Mexico Using Structural Colorants
Centre for Print Research, University of the West of England, Bristol, UK.ORCID iD: 0000-0001-9444-4259
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-0983-260x
Centre for Print Research, University of the West of England, Bristol, UK.
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2023 (English)In: Colorants, ISSN 2079-6447, Vol. 2, no 4, p. 632-653Article in journal (Refereed) Published
Abstract [en]

Two of the most significant cases of extant 16th-century featherwork from Mexico are the so-called Moctezuma’s headdress and the Ahuizotl shield. While the feathers used in these artworks exhibit lightfast colors, their assembly comprises mainly organic materials, which makes them extremely fragile. Printed media, including books, catalogs, educational materials, and fine copies, offer an accessible means for audiences to document and disseminate visual aspects of delicate cultural artifacts without risking their integrity. Nevertheless, the singular brightness and iridescent colors of feathers are difficult to communicate to the viewer in printed reproductions when traditional pigments are used. This research explores the use of effect pigments (multilayered reflective structures) and improved halftoning techniques for additive printing, with the objective of enhancing the reproduction of featherwork by capturing its changing color and improving texture representation via a screen printing process. The reproduced images of featherwork exhibit significant perceptual resemblances to the originals, primarily owing to the shared presence of structural coloration. We applied structure-aware halftoning to better represent the textural qualities of feathers without compromising the performance of effect pigments in the screen printing method. Our prints show angle-dependent color, although their gamut is reduced. The novelty of this work lies in the refinement of techniques for printing full-color images by additive printing, which can enhance the 2D representation of the appearance of culturally significant artifacts.

Place, publisher, year, edition, pages
2023. Vol. 2, no 4, p. 632-653
Keywords [en]
Featherwork, Iridescence, Structural color, Screen printing, Effect pigments
National Category
Media Engineering
Identifiers
URN: urn:nbn:se:liu:diva-202037DOI: 10.3390/colorants2040033OAI: oai:DiVA.org:liu-202037DiVA, id: diva2:1848934
Available from: 2024-04-05 Created: 2024-04-05 Last updated: 2024-04-05Bibliographically approved
In thesis
1. Modelling appearance printing: Acquisition and digital reproduction of translucent and goniochromatic materials
Open this publication in new window or tab >>Modelling appearance printing: Acquisition and digital reproduction of translucent and goniochromatic materials
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Colour perception is fundamental to our everyday experiences, allowing us to communicate and interpret visual information effectively. Yet, replicating these experiences accurately poses a significant challenge, particularly in the context of full-colour 3D printing. Advances in this field have revolutionised the fabrication of customised prosthetic body parts, such as eyes, teeth, and skin features, with profound implications for medical and aesthetic applications.

The key to successful 3D printing lies in the digital preview of objects before fabrication, enabling users to assess colour reproduction and quality. However, accurately representing colour in a digital environment is complex, as it depends on numerous factors, including illumination, object shape, surface properties, scene context, and observer characteristics. Traditional methods of previewing conventional 2D prints overlook this complexity.

This thesis addresses this challenge by focusing on two types of materials: semitransparent polymers commonly used in 3D printing, and goniochromatic colorants employed in printing to introduce unique effects unattainable with conventional inks for 2D printing. For semitransparent materials, we developed an empirical function to represent colour based on sample thickness, enabling efficient digital representation. Additionally, we adapted a colour measuring device to identify two key material parameters, absorption and scattering coefficients, essential for accurate colour reproduction.

Goniochromatic materials, such as thin film-coated mica particles, are slightly more complicated and less predictive in terms of their final colour appearance. Although not yet used in 3D printing, these particles used in conventional printing introduce colour variation while rotating the print. We found that goniochromatic properties can be expressed with an empirically found function after collecting angle-dependent light reflecting properties of the sample. We used this function and showed how prints with goniochromatic materials can be efficiently previewed on a computer monitor.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2024. p. 66
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2379
Keywords
Material appearance, 3D printing, Goniochromatism, Translucency
National Category
Media Engineering
Identifiers
urn:nbn:se:liu:diva-202036 (URN)10.3384/9789180755573 (DOI)9789180755566 (ISBN)9789180755573 (ISBN)
Public defence
2024-05-03, K3, Kåkenhus, Campus Norrköping, Norrköping, 09:15 (English)
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Supervisors
Note

Funding agency: The Marie Skłodowska-Curie Actions Innovative Training Network

Available from: 2024-04-05 Created: 2024-04-05 Last updated: 2024-05-06Bibliographically approved

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Abedini, FereshtehPranovich, Alina

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