Archival repositories can generate surrogates for various purposes, such as PDFs for print reproduction, JPEGs for online display, and TIFFs for storage.
The hundredth copy of a digital image is indistinguishable from its progenitors. Electronic copies suffer no degradation through the duplication process, unlike other forms of copying, such as facsimiles. A copy of a digital image is indistinguishable from its source, while the original can lose its meaning in this electronic world.