The problem is indeed serious.
In all there are some nuances.
First of all, there are paintings and old. With dull varnish. Sometimes - with illuminated.
I shoot in natural lighting, under 60 degrees, with a tripod, remote control.
Icon of "breaking through" artificial lateral (both sides) lighting through the umbrella of white. Before shooting, rubbed my (old) icons (without peeling) rast.maslom.
Still have to haul color photoshop.
Even after scanning.
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