Bidirectional Reflectance and Texture Database of Printed Special Effect Colors

摘要

A research project is underway to create a bidirectionalrnreflectance and texture database of printed special effect colors.rnSuch data is needed in the printing industry to determinernthe required measuring geometries characterizing the bidirectionalrnreflectance distribution function (BRDF) and texture functionrn(BTF), to develop quality measures for process control, andrnto simulate the prints’ appearance on displays (soft proofing).rnFlexo printing was used to apply 28 special effect inks withrnthree tonal values on a matt and glossy paper substrate. The inksrnwere selected to cover a wide range of different pigment classesrnand with respect to their demand in the printing market. To allowrnfor multiple usage scenarios the inks were printed on a black andrnwhite background and partly finished with a glossy varnish resultingrnin a total of 672 different samples. The patches were measuredrnin a preliminary stage with the BYK-mac multi-angle spectrophotometer.rnEvaluations on the diversity of the samples in terms ofrnselected appearance parameters such as color flop or sparkle intensityrnare determined based on these measurements. The data isrnprovided on our website and will be supplemented with additionalrnmeasurements performed by a gonio-imaging system.