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ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis

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Research on Assessment Methods of Spectral Reflectance Data Quality for Computer Color Matching.

Cheng-dong He, Xiao-xia Wan, Xin-guo Huang

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|September 19, 2018

Summary

This summary is machine-generated.

A new lightness and chromaticity comparative method simplifies spectral reflectance data quality evaluation for computer color matching. This method is more intuitive than existing spectral reflectance and K/S methods, especially for transparent inks on challenging substrates like silver-foiled paper.

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Area of Science:

Color Science
Materials Science
Imaging Technology

Background:

Spectral reflectance data quality is crucial for accurate computer color matching.
Existing evaluation methods (spectral reflectance and K/S) are overly complex for practical application.

Purpose of the Study:

To develop and validate a simpler, more intuitive method for evaluating spectral reflectance data quality.
To compare the proposed method with existing techniques using offset ink samples on different paper substrates.

Main Methods:

Utilized 45°/0° and d/8° geometric conditions for spectral reflectance measurements of offset inks on coated and silver-foiled paper.
Improved the spectral reflectance method by refining geometric conditions.
Introduced and compared a novel lightness and chromaticity comparative method against established techniques.

Main Results:

Both 45°/0° and d/8° (Specular Component Included) geometric conditions are suitable for coated paper, but 45°/0° is inadequate for silver-foiled paper.
d/8° SCI measurements revealed lower reflectance for white ink on silver-foiled paper and abnormal spectral curves for cyan and magenta inks at high concentrations.
The lightness and chromaticity curves showed significant divergence for cyan and magenta inks compared to the reference coated paper.

Conclusions:

Transparent ink spectral reflectance should be equal to or greater than other primary inks.
Maximum concentrations for cyan and magenta inks need limitation to ensure spectral quality.
The lightness and chromaticity comparative method offers a more intuitive analysis, particularly when using a well-diffusing coated paper as a reference.