Most of the jpegs on this site were extracted from reference images (high-resolution tiffs, 20 to over 200 megabytes in size) downloaded from the Library of Congress online archive. (To query the database click here.) Most of them were digitized by LOC contractors using a Sinar digital back. They are adjusted by your webmaster for contrast and color using Photoshop CS3, a process that can take around an hour per image. There are a number of before-and-after examples on the site. One day I'll give them a gallery of their own. -- Dave
