Every Duplicate Costs A Generation

Photographic copying is not reproduction in the modern sense. Each duplicate is a new photograph of an existing image, and the difference compounds with every step.

Copying film means photographing it again

To make a new element, film is printed onto fresh stock through an optical system. The result records the original image as accurately as that stock and that machine allow.

Accuracy is never total. Grain from both generations adds together, contrast increases, and the tonal range at the extremes compresses slightly with each pass.

Repeat that a few times and the accumulated effect is obvious: a muddier, grainier, higher-contrast image that has lost detail in shadows and highlights permanently.

Distribution was built out of these steps

Release prints were never struck directly from the camera negative, which was too valuable to run repeatedly. Intermediate elements existed to protect it and to allow volume printing.

A print in a cinema therefore sat several generations down by design. That was an acceptable trade when the negative was safe and prints were disposable.

When the negative is lost, that chain becomes the archive's problem, because the surviving material is whatever happened to be at the far end of it.

Archives count generations as a matter of record

Cataloguing an element includes establishing what it was made from. A holding described only as a print says little; its position in the chain says a great deal.

This determines priority. Two archives holding the same title do not hold equivalent material, and the earlier-generation element is the one worth spending money on.

Identifying position is partly detective work, using edge markings, laboratory codes and the visible characteristics of the image itself.

Digital changes the arithmetic but not the principle

Copying a file produces an identical file, so generational loss in the photographic sense disappears once material has been scanned.

What replaces it is loss at the point of encoding. Each time material is re-compressed for a new delivery format, information is discarded and cannot be recovered by any later step.

The same applies to image processing. Grain reduction, sharpening and stabilisation all rewrite the picture, and a file that has passed through several such passes carries all of them.

The original scan becomes the thing to protect

Because encoding losses accumulate the same way, archives treat the first, least processed scan as the preservation master and derive everything else from it.

Working from a delivery copy because it is convenient reintroduces the old problem in a new form, and the damage is just as permanent as it was on film.

Keeping the master untouched also allows later work to start again cleanly. Tools improve, and a project that only retained its graded output has thrown away that possibility.