Is there a way to measure gloss with a spectrophotometer or is it necessary to have a glossmeter? Is there a conversion between CIELAB values and gloss?
You cannot convert CIELAB values to gloss as they are designed to measure the diffuse color and not the gloss. You can get some measure of gloss with an integrating sphere spectrophotometer by comparing the Y tristimulus values for measurements in specular included and specular excluded geometries. A diffuse sample will have no difference while a very glossy sample will have a difference on the order of 4% or so. It is better to have a gloss meter.
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