We have been scanning artwork for well over 20 years. We use a vertical copy camera with a Betterlight Scan Back. The Betterlight scan back is a true 48 megapixel scan with no Bayer pattern interpolation. It has the capability to increase the file up to 108 megapixels through hardware interpolation, although we rarely find a case to use this feature.
We also have the ability to scan through glass (although not preferred), if your artwork has already been framed. This alleviates the problem of removing the artwork from the expensive frame and removing the back paper.
Just a small sampling of some of the artists that we do reproductions for:
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