On the finest scale, which doesn’t get preserved so well either in the exported tifs, and definitely not in the jpgs, the images are vectors or pixel blocks of solid colour, and not gradients at all. Secondly, this started as a closeup of Mary in Altarretabel in drei Abteilung mit dem Gnadenstuhl, from after 1250, originally in Kirche St. Maria zur Wiese in Soest, and currently in Berlin’s Gemäldegalerie, the closeup is image #21.
