Fig. 2From: Revealing the painterly technique beneath the surface of Vermeer’s Girl with a Pearl Earring using macro- and microscale imagingComputer-assisted thread-level canvas analysis (from 2018 X-radiograph made by René Gerritsen Art & Research Photography). a Horizontal thread spacing (mm). b Vertical thread spacing (mm). c Horizontal thread angle (degrees). d Vertical thread angle (degrees)Back to article page