Method for determining the surface gloss of a colour standard

Abstract

The invention relates to a method for determining the gloss of a colour standard comprising the following steps: A) experimentally determining reflection spectra R(exp) of the colour standard, comprising a first reflection spectrum and a second reflection spectrum, with an integrating sphere colour measurement instrument, wherein said first reflection spectrum is obtained at (A1) d/8-geometry with the specular component included, and said second reflection spectrum is obtained at (A2) d/8-geometry with the specular component excluded, and B) converting reflection spectra data of the experimentally determined reflection spectra R(exp) of the colour standard to gloss values by: B1) acquiring the difference reflection spectrum ΔR of the experimentally determined reflection spectrum R(exp) with the specular component included (A1) and the reflection spectrum R (exp) with the specular component excluded (A2), and B2) determining the gloss values corresponding to said difference reflection spectrum ΔR with the assistance of previously prepared calibration curves, representing the functional relationship between the difference reflection spectrum ΔR and the gloss values measured at one or more gloss angles.

1 . A method for determining the gloss of a colour standard, said method comprising the steps of:
 A) experimentally determining reflection spectra R(exp) of the colour standard, comprising a first reflection spectrum and a second reflection spectrum, with an integrating sphere colour measurement instrument, wherein said first reflection spectrum is obtained at   (A1) d/8°-geometry or 8°/d-geometry with the specular component included, and said second reflection spectrum is obtained at   (A2) d/8°-geometry or 8°/d-geometry with the specular component excluded, and   B) converting reflection spectra data of the experimentally determined reflection spectra R(exp) of the colour standard to gloss values by:   B1) acquiring a difference reflection spectrum ΔR of the experimentally determined reflection spectrum R(exp) with the specular component included (A1) and the experimentally determined reflection spectrum R(exp) with the specular component excluded (A2), and   B2) determining the gloss values corresponding to said difference reflection spectrum ΔR with the assistance of previously prepared calibration curves representing the functional relationship between the difference reflection spectrum ΔR and the gloss values measured at one or more gloss angles.   
     
     
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