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Article

Assessing the Spectral Characteristics of Dye- and Pigment-Based Inkjet Prints by VNIR Hyperspectral Imaging

by 1,*, 1 and 1,2
1
Department of Radioelectronics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
2
FOMEI s.r.o., U Libeňského pivovaru 2015, 180 00 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Arturo Sanchez-Azofeifa
Sensors 2022, 22(2), 603; https://doi.org/10.3390/s22020603
Received: 3 December 2021 / Revised: 28 December 2021 / Accepted: 10 January 2022 / Published: 13 January 2022
Fine art photography, paper documents, and other parts of printing that aim to keep value are searching for credible techniques and mediums suitable for long-term archiving purposes. In general, long-lasting pigment-based inks are used for archival print creation. However, they are very often replaced or forged by dye-based inks, with lower fade resistance and, therefore, lower archiving potential. Frequently, the difference between the dye- and pigment-based prints is hard to uncover. Finding a simple tool for countrified identification is, therefore, necessary. This paper assesses the spectral characteristics of dye- and pigment-based ink prints using visible near-infrared (VNIR) hyperspectral imaging. The main aim is to show the spectral differences between these ink prints using a hyperspectral camera and subsequent hyperspectral image processing. Two diverse printers were exploited for comparison, a hobby dye-based EPSON L1800 and a professional pigment-based EPSON SC-P9500. The identical prints created via these printers on three different types of photo paper were recaptured by the hyperspectral camera. The acquired pixel values were studied in terms of spectral characteristics and principal component analysis (PCA). In addition, the obtained spectral differences were quantified by the selected spectral metrics. The possible usage for print forgery detection via VNIR hyperspectral imaging is discussed in the results. View Full-Text
Keywords: hyperspectral imaging; VNIR; inkjet printing; dyes; pigments; photo paper; archiving hyperspectral imaging; VNIR; inkjet printing; dyes; pigments; photo paper; archiving
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MDPI and ACS Style

Krauz, L.; Páta, P.; Kaiser, J. Assessing the Spectral Characteristics of Dye- and Pigment-Based Inkjet Prints by VNIR Hyperspectral Imaging. Sensors 2022, 22, 603. https://doi.org/10.3390/s22020603

AMA Style

Krauz L, Páta P, Kaiser J. Assessing the Spectral Characteristics of Dye- and Pigment-Based Inkjet Prints by VNIR Hyperspectral Imaging. Sensors. 2022; 22(2):603. https://doi.org/10.3390/s22020603

Chicago/Turabian Style

Krauz, Lukáš, Petr Páta, and Jan Kaiser. 2022. "Assessing the Spectral Characteristics of Dye- and Pigment-Based Inkjet Prints by VNIR Hyperspectral Imaging" Sensors 22, no. 2: 603. https://doi.org/10.3390/s22020603

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