What Changes When a Record Is Digitised
Launch library · evergreen read

Digitisation makes a record searchable and shareable in ways a physical original never could be, but it does not make it identical to that original. Colour, texture, watermarks and the physical relationship between pages can each be lost or flattened in a scan, even a very good and carefully made one.
A digitised file also inherits a new layer of metadata worth noting: when it was scanned, by whom, at what resolution, and under what particular project or funding arrangement. That metadata is worth recording alongside your citation, since it can matter later if a claim is ever challenged by an editor or a careful reader.
Where possible, treating digitisation as a starting point rather than a true endpoint keeps a writer honest about the limits of a scan. If a detail matters enough to build a claim on, it is worth confirming against the physical item when access genuinely allows it.