Free of charge are the following resources from the Digital Production Services (DPS) at Stanford University Libraries:
Catalog of reference images to use for image quality control: https://lib.stanford.edu/digital-production-services/quality-assurance-image-defects
Cropping guide: https://lib.stanford.edu/digital-production-services/quality-assurance-cropping-guide
Source of information: Jane Hedberg, “Preservation News,” C&RL News 73 (2012) : 563.
Until December 31, 2012, those involved in digitization can review the draft of minimum specifications for sustainable digitization. The authors of Minimum Digitization Capture Recommendations did extensive research including the review of practices at more than 50 organizations. The specifications are designed to establish understanding, not to dictate standards. They are available at http://connect.ala.org/node/185648
Source of this information: Jane Hedberg, “Preservation News,” C&RL News, 73 (2012): 563.
The Regional Alliance for Preservation includes member organizations from across the United States. It has conservators who work with paintings, textiles, the gamut. Course offerings are listed into 2013. Take a look at this rich site! http://rap-arcc.org/