I have not tried this yet on paintings that are larger than the width of my scanner, but I might give it a try.
http://www.susansavad.com/t_scan.html
It’d have to be cheaper than trying to get a professional camera studio together, trying to buy gigantic flatbed scanners, or taking paintings off of the stretchers to have some place like Kinkos scan them in their big roll scanners (cost of doing that is like 7 bucks just for getting a digital scan – no printing cost – tha’d be extra, and then I think only flimsy paper stuff works.. and I doubt they’d put charcoal type stuff in their scanner, but I could be wrong?)
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On the other hand…
Some of the arguments against flatbed scanning mentioned over at http://photo.net/photography-lighting-equipment-techniques-forum/00Tl26 are pretty good ones…
Jeff Thomann's Blog 