What damage cannot be repaired in an old photo

Five kinds of damage are genuinely beyond repair: image layer that is physically gone, silver mirroring that has swallowed the picture completely, a face that was never captured sharply in the first place, a print whose surface tore away when it was fused to glass or to another photograph, and detail lost when the only scan was made at too low a resolution. Everything else is usually recoverable to some degree.

We publish this because the rest of this site is about what restoration can do, and a claim is only worth something if it has an edge. Here is ours.

The rule underneath all five

Restoration rebuilds from surviving detail. That is the whole mechanism, whether the work is done by a model in two seconds or by a person over two hours. The damaged area is filled in using what the surrounding image implies, and the more that survives, the more constrained and therefore more truthful the result.

So the question is never how bad the damage looks. It is how much information is left. A photograph that has almost vanished into tarnish can hold a complete portrait, because contrast collapses long before detail does, and our page on faded and darkened photos shows exactly that. A photograph with a small clean hole in it has lost that area absolutely. The dramatic one is recoverable and the tidy one is not.

One: the image layer is physically gone

On a print, the picture lives in a thin layer on top of the paper. Abrasion, flaking, emulsion lifted by water, a tear where the piece is missing, and the paper is still there while the photograph is not.

Our fix pages carry an example of this from the same collection as every repair we show: a plate whose face has been worn away entirely by a century of abrasion. A model will happily produce a face there. It will not be the right one, because nothing in that area constrains it. The line is not subtle once you know to look for it.

What decides the outcome is the size of the gap relative to the surviving context. A scratch a hair wide across a cheek is bounded on both sides by real skin and reconstructs almost perfectly. A missing square centimetre of face is bounded by nothing useful. The same technology produces a near-perfect result on one and a fabrication on the other.

Two: total silver mirroring

Very old silver-based photographs tarnish like unpolished silverware. In moderate cases the picture sinks into a dark bluish mirror and is still entirely readable underneath, and restoration brings it back with results that look like a trick. Our deteriorated and mottled photos page covers that middle ground.

Total mirroring is different. When the tarnish has consumed the image rather than veiled it, tilting the plate under light shows a mirror with nothing in it, no trace of a portrait at any angle. That is not a contrast problem and no tonal adjustment reaches it.

The honest test costs nothing: tilt it, move the light, look for any hint of the picture. If something is faintly there, restoration usually has enough to work with. If there is genuinely nothing at any angle, there is nothing to pull back.

Three: a face that was never captured

This one surprises people, because the print can be in perfect condition.

If the original photograph was taken with camera shake, with the focus on the background, or at a distance where the face occupied a few dozen pixels worth of detail, then the likeness was never recorded. No later step can retrieve it, because the failure happened in the fraction of a second the shutter was open. Sharpening and upscaling will make the face look crisper by inferring edges, which is an improvement in appearance and not a recovery of anything. The full breakdown is in how to fix a blurry old photo.

The one exception is worth checking before you give up: if the print is soft but the negative or slide still exists, the sharp version may be sitting in a drawer. Prints from the consumer era often lost detail in the enlarging process that the negative still holds. Our guide on scanning slides and negatives at home covers getting it off the film.

Four: a surface that tore away

Photographs stored against glass, stacked face to back in humidity, or soaked and then dried can fuse. The bond is often stronger than the image layer itself, so pulling them apart takes the picture with it and leaves it on the glass or on the neighbouring print.

The loss happens at the moment of separation, which means this is the one on the list you can still prevent. Do not pull. Scan the block exactly as it is first, so a copy exists before anything is risked, then read freeing a photo stuck to glass and separating photos stuck together before you decide whether to attempt anything at all. Where the photograph is irreplaceable, a conservator is the right call and is cheaper than the alternative.

Once the emulsion has transferred, the affected area falls under the first category on this list. It is gone.

Five: detail lost to a bad scan, when the print no longer exists

A low-resolution scan caps everything downstream. If the print still exists, this is not damage at all, it is a five-minute fix: rescan at a proper setting and the ceiling lifts. Our scan resolution calculator and what DPI to scan old photos at cover the settings.

It becomes permanent only when the original is gone and a small, compressed file is all that remains. Enlarging it produces inferred detail, never recovered detail. It is on this list because it is the only entry that is entirely self-inflicted and entirely avoidable, and because a surprising number of family collections now exist only as thumbnails somebody emailed in 2009.

What is still worth doing when the answer is no

A photograph that cannot be restored can still be preserved, and the two jobs are unrelated.

Scan it now, at a good resolution. Deterioration is progressive. Today’s scan holds more photograph than next year’s will, and it costs an afternoon.

Stop the loss. Move it out of the attic, the garage and the sunlight, into acid-free storage at moderate stable humidity. How to store old photographs is the short version.

Restore what surrounds the loss. A portrait with an unrecoverable face may still be worth cleaning up for its clothing, its setting and the moment it records. Be clear with yourself and with the family about which part is real.

Keep the master for a better tool. Models improve every year. The photograph that defeats today’s software may not defeat the one that exists in five years, and the only way to find out is to have kept a clean capture.

Our app, Photo Restore, is built on the same models this page describes, so it runs into exactly the same wall. We would rather say that here than have you discover it on a photograph that mattered. Where the picture survives, the results are genuinely remarkable. Where it does not, what comes back is an invention, and an invention of someone’s face is not a small thing to hand to a family.