Bidirectional Reflectance and Texture Database of Printed Special Effect Colors
Abstract:A research project is underway to create a bidirectional reflectance and texture database of printed special effect colors. Such data is needed in the printing industry to determine the required measuring geometries characterizing the bidirectional reflectance distribution function (BRDF) and texture function (BTF), to develop quality measures for process control, and to simulate the prints' appearance on displays (soft proofing).
Flexo printing was used to apply 28 special effect inks with three tonal values on a matt and glossy paper substrate. The inks were selected to cover a wide range of different pigment classes and with respect to their demand in the printing market. To allow for multiple usage scenarios the inks were printed on a black and white background and partly finished with a glossy varnish resulting in a total of 672 different samples. The patches were measured in a preliminary stage with the BYK-mac multi-angle spectrophotometer. Evaluations on the diversity of the samples in terms of selected appearance parameters such as color flop or sparkle intensity are determined based on these measurements. The data is provided on our website and will be supplemented with additional measurements performed by a gonio-imaging system.
Document Type: Research Article
Publication date: 2011-01-01
CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, and a vibrant interactive papers session. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper presentation.
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