{"course":{"slug":"image-editing","title":"Editing an Image","url":"https://addaly.com/learn/image-editing","level":"beginner","track":"create"},"lesson":{"slug":"restoring-a-damaged-photograph","title":"Tears, mould and the cyan that faded first","url":"https://addaly.com/learn/image-editing/restoring-a-damaged-photograph","position":48,"of":78,"minutes":9,"answer":"Restoration runs large damage to small, the pink cast on old colour prints is the cyan dye layer having faded and can be neutralised but not recovered.","keyIdea":"Restoration runs large damage to small, the pink cast on old colour prints is the cyan dye layer having faded and can be neutralised but not recovered, and anything reconstructed rather than derived from surviving evidence belongs in a written note delivered with the file."},"body":{"format":"markdown","text":"## An order that keeps you out of trouble\n\nRestoration goes wrong when people start with the interesting part. The order:\n\n1. **Scan, and archive the raw scan untouched.** Everything after this is a copy.\n2. **Global tone.** Recover contrast from a faded original before judging anything else: damage that looked catastrophic often turns out to be faint.\n3. **Global colour.** Correct the cast. Again, before the detail work, because you will be matching colours.\n4. **Large structural damage**: tears, missing corners, holes. Reconstruct geometry first, exactly as in the object-removal lesson.\n5. **Medium damage**: creases, stains, mould blooms, silvering.\n6. **Small damage**: dust, scratches, spots.\n7. **Local tone**, to even out what the repairs left.\n8. **Grain matching**, so the repairs sit in the original's texture.\n9. **Output**, sized and sharpened for whatever the family actually wants.\n\nWorking small-to-large means redoing the small work after every large repair. Working large-to-small means you only do it once.\n\n## Why old colour prints go red\n\nA useful piece of mechanism. Colour prints and negatives hold three dye layers: cyan, magenta and yellow. They do not fade at the same rate. In the common chromogenic processes the **cyan dye is the least stable**, so it goes first.\n\nRemove cyan and what remains is magenta and yellow, which together read as red-orange. That is why every 1970s and 1980s family photograph has the same salmon-pink cast. It is not the paper yellowing; it is a specific dye layer failing.\n\nThe correction follows directly: you need to **add back cyan**, which means reducing red. A Curves layer with the Red channel pulled down in the midtones, or a Colour Balance shifted towards cyan, targeted at the tonal range where the cast is worst: usually the midtones and highlights rather than the shadows.\n\nThe limit is equally direct. Where the cyan dye has faded completely, there is no cyan information to restore. You can neutralise the cast, and what you get back is a grey-ish, low-saturation image rather than the original colours, because the data in that channel is gone. Pushing further produces noise and channel banding, not colour.\n\nFor badly faded prints, converting to black and white is often the honest and better-looking answer. Say so to the family; most prefer a good monochrome to a bad approximation of colour.\n\n## The specific damage types\n\n**Tears and missing corners.** Reconstruct the geometry by hand. Where a corner is gone entirely and contained nothing but background, clone from the opposite corner. Where it contained content, you are inventing, and that needs to be said.\n\n**Creases.** A crease is a tonal line, not missing content: the emulsion is cracked but the image either side survives. The Healing Brush along the crease, in short strokes following its direction, works well. Where it crosses a face, work on a frequency-separated pair so you fix the tone on low and the texture on high.\n\n**Mould and foxing**: brown spots, usually round. These are tonal and colour damage over intact image. A masked Curves plus a desaturation, or a patch from a clean area with the tone corrected, both work. Heavy mould has eaten the emulsion and is a reconstruction.\n\n**Silvering**: the mirror-like metallic sheen on the dark areas of old black-and-white prints, caused by silver migrating to the surface. It appears as a blue-grey iridescence. Scan with the print slightly angled to reduce it, then desaturate the affected areas and rebuild the tone. It cannot be fully removed because the surface is physically altered.\n\n**Water damage and staining.** Usually a large soft tonal and colour shift. A masked Curves layer with an inverse gradient often removes most of it in one move, which is far better than cloning.\n\n**Fading at the edges from a frame or an album** produces a rectangle of different density. Again tonal, again a masked adjustment rather than cloning.\n\n## Rebuilding what is missing\n\nThree sources, in order of honesty:\n\n**Symmetry.** A missing half of a shirt collar, a chair arm, a window frame: mirror the good side. Real content, correctly derived.\n\n**Elsewhere in the same photograph.** A missing patch of grass, wall, sky, fabric. Borrowed content from the same moment.\n\n**Another photograph of the same subject.** A missing ear from another frame of the same person on the same day. This is what professional restorers do, and it is why the first question to a family should be \"are there other pictures from that day?\"\n\nAnd then the fourth, which is different in kind: **inventing it**, by hand or with a generative model. That produces a plausible ear that is not their ear. For a family photograph on a wall, many people are content with that and they should be told it is what happened. For anything archival, historical or evidential, it is not acceptable, because it introduces fiction into a record.\n\n## Documenting what you did\n\nThe practice that separates restoration from alteration, and it costs five minutes:\n\n- Keep the untouched scan, named clearly, and deliver it alongside the restoration.\n- Write a short note: \"Tear across lower left reconstructed from surrounding wall. Missing corner filled with background. Colour cast corrected; original cyan layer substantially faded, so colours are approximate. Child's face on right rebuilt partly from the second photograph supplied.\"\n- Deliver the layered file if the client can use it.\n\nArchives and museums require this. Families appreciate it. And it protects you, because in ten years somebody will ask whether great-aunt's brooch was that shape.\n\n## The free path\n\nGIMP with Resynthesizer covers structural fill. G'MIC has a large set of restoration filters including inpainting and dust removal. darktable's negadoctor handles film negatives. Krita's Smart Patch is good for spot work. Everything in this lesson is achievable at no cost, and restoration is an area where patience matters far more than the software.\n\n## What cannot be restored\n\nWhere the emulsion is gone, there is no image. Where a dye has fully faded, there is no colour. Where a print was out of focus, it is out of focus. Restoration recovers what survives and reconstructs what can be derived. Everything beyond that is drawing, and drawing on a photograph is a different act that deserves a different name and a sentence in the delivery note."},"check":{"question":"A 1978 family print has a strong salmon-pink cast. After correcting it with a Curves move on the red channel, the image is neutral but the colours are weak and desaturated, and pushing saturation produces noise. Why?","options":[{"text":"The scan was 8-bit, so the correction exhausted the available levels; rescanning in 16-bit would restore the colour.","correct":false,"tempting":"Offers a real precision improvement that subdivides the surviving signal more finely without adding colour information that the print no longer carries."},{"text":"The cyan dye layer has substantially faded, so neutralising the cast removes the imbalance without restoring information that is no longer in the print.","correct":true},{"text":"The correction should have been applied to the cyan channel rather than the red channel, which is why the result is weak.","correct":false,"tempting":"Treats an RGB file as though it had a cyan channel: reducing red is precisely how cyan is added in RGB, so the move described was correct."},{"text":"Curves applied to a single channel always reduces saturation, and a Colour Balance adjustment would have preserved it.","correct":false,"tempting":"Invents a property of channel curves: a single-channel curve changes colour balance and can raise saturation as easily as lower it."}]},"prev":{"slug":"scanning-a-print","title":"Getting the photograph off the paper","url":"https://addaly.com/learn/image-editing/scanning-a-print"},"next":{"slug":"what-cannot-be-repaired","title":"Four losses that no tool undoes","url":"https://addaly.com/learn/image-editing/what-cannot-be-repaired"},"authorship":"Founder and series editor: Dr Mustafa Mun. Written by AI models to a written standard. Exam keys checked blind by a second model: 3,665 of 3,666 agreed. Academic review invited.","review":{"status":"Draft, open for academic review"},"cite":"Addaly (2026) 'Tears, mould and the cyan that faded first', in Editing an Image. Edited by M. Mun. Addaly. Available at: https://addaly.com/learn/image-editing/restoring-a-damaged-photograph (Accessed: 13 October 2026).","licence":{"name":"CC BY-NC-SA 4.0","url":"https://creativecommons.org/licenses/by-nc-sa/4.0/"},"reader":{"schema":1,"title":"Tears, mould and the cyan that faded first","courseTitle":"Editing an Image","module":{"index":5,"slug":"repair-and-retouching","title":"Repair and retouching"},"answer":null,"keyIdea":"Restoration runs large damage to small, the pink cast on old colour prints is the cyan dye layer having faded and can be neutralised but not recovered, and anything reconstructed rather than derived from surviving evidence belongs in a written note delivered with the file.","hero":{"kind":"plate","image":null,"alt":null,"caption":null},"blocks":[{"t":"h2","id":"an-order-that-keeps-you-out-of-trouble","runs":[{"text":"An order that keeps you out of trouble"}]},{"t":"p","runs":[{"text":"Restoration goes wrong when people start with the interesting part. The order:"}]},{"t":"ol","start":1,"items":[[{"text":"Scan, and archive the raw scan untouched.","b":true},{"text":" Everything after this is a copy."}],[{"text":"Global tone.","b":true},{"text":" Recover contrast from a faded original before judging anything else: damage that looked catastrophic often turns out to be faint."}],[{"text":"Global colour.","b":true},{"text":" Correct the cast. Again, before the detail work, because you will be matching colours."}],[{"text":"Large structural damage","b":true},{"text":": tears, missing corners, holes. Reconstruct geometry first, exactly as in the object-removal lesson."}],[{"text":"Medium damage","b":true},{"text":": creases, stains, mould blooms, silvering."}],[{"text":"Small damage","b":true},{"text":": dust, scratches, spots."}],[{"text":"Local tone","b":true},{"text":", to even out what the repairs left."}],[{"text":"Grain matching","b":true},{"text":", so the repairs sit in the original’s texture."}],[{"text":"Output","b":true},{"text":", sized and sharpened for whatever the family actually wants."}]]},{"t":"p","runs":[{"text":"Working small-to-large means redoing the small work after every large repair. Working large-to-small means you only do it once."}]},{"t":"h2","id":"why-old-colour-prints-go-red","runs":[{"text":"Why old colour prints go red"}]},{"t":"p","runs":[{"text":"A useful piece of mechanism. Colour prints and negatives hold three dye layers: cyan, magenta and yellow. They do not fade at the same rate. In the common chromogenic processes the "},{"text":"cyan dye is the least stable","b":true},{"text":", so it goes first."}]},{"t":"p","runs":[{"text":"Remove cyan and what remains is magenta and yellow, which together read as red-orange. That is why every 1970s and 1980s family photograph has the same salmon-pink cast. It is not the paper yellowing; it is a specific dye layer failing."}]},{"t":"p","runs":[{"text":"The correction follows directly: you need to "},{"text":"add back cyan","b":true},{"text":", which means reducing red. A Curves layer with the Red channel pulled down in the midtones, or a Colour Balance shifted towards cyan, targeted at the tonal range where the cast is worst: usually the midtones and highlights rather than the shadows."}]},{"t":"p","runs":[{"text":"The limit is equally direct. Where the cyan dye has faded completely, there is no cyan information to restore. You can neutralise the cast, and what you get back is a grey-ish, low-saturation image rather than the original colours, because the data in that channel is gone. Pushing further produces noise and channel banding, not colour."}]},{"t":"p","runs":[{"text":"For badly faded prints, converting to black and white is often the honest and better-looking answer. Say so to the family; most prefer a good monochrome to a bad approximation of colour."}]},{"t":"h2","id":"the-specific-damage-types","runs":[{"text":"The specific damage types"}]},{"t":"p","runs":[{"text":"Tears and missing corners.","b":true},{"text":" Reconstruct the geometry by hand. Where a corner is gone entirely and contained nothing but background, clone from the opposite corner. Where it contained content, you are inventing, and that needs to be said."}]},{"t":"p","runs":[{"text":"Creases.","b":true},{"text":" A crease is a tonal line, not missing content: the emulsion is cracked but the image either side survives. The Healing Brush along the crease, in short strokes following its direction, works well. Where it crosses a face, work on a frequency-separated pair so you fix the tone on low and the texture on high."}]},{"t":"p","runs":[{"text":"Mould and foxing","b":true},{"text":": brown spots, usually round. These are tonal and colour damage over intact image. A masked Curves plus a desaturation, or a patch from a clean area with the tone corrected, both work. Heavy mould has eaten the emulsion and is a reconstruction."}]},{"t":"p","runs":[{"text":"Silvering","b":true},{"text":": the mirror-like metallic sheen on the dark areas of old black-and-white prints, caused by silver migrating to the surface. It appears as a blue-grey iridescence. Scan with the print slightly angled to reduce it, then desaturate the affected areas and rebuild the tone. It cannot be fully removed because the surface is physically altered."}]},{"t":"p","runs":[{"text":"Water damage and staining.","b":true},{"text":" Usually a large soft tonal and colour shift. A masked Curves layer with an inverse gradient often removes most of it in one move, which is far better than cloning."}]},{"t":"p","runs":[{"text":"Fading at the edges from a frame or an album","b":true},{"text":" produces a rectangle of different density. Again tonal, again a masked adjustment rather than cloning."}]},{"t":"h2","id":"rebuilding-what-is-missing","runs":[{"text":"Rebuilding what is missing"}]},{"t":"p","runs":[{"text":"Three sources, in order of honesty:"}]},{"t":"p","runs":[{"text":"Symmetry.","b":true},{"text":" A missing half of a shirt collar, a chair arm, a window frame: mirror the good side. Real content, correctly derived."}]},{"t":"p","runs":[{"text":"Elsewhere in the same photograph.","b":true},{"text":" A missing patch of grass, wall, sky, fabric. Borrowed content from the same moment."}]},{"t":"p","runs":[{"text":"Another photograph of the same subject.","b":true},{"text":" A missing ear from another frame of the same person on the same day. This is what professional restorers do, and it is why the first question to a family should be “are there other pictures from that day?”"}]},{"t":"p","runs":[{"text":"And then the fourth, which is different in kind: "},{"text":"inventing it","b":true},{"text":", by hand or with a generative model. That produces a plausible ear that is not their ear. For a family photograph on a wall, many people are content with that and they should be told it is what happened. For anything archival, historical or evidential, it is not acceptable, because it introduces fiction into a record."}]},{"t":"h2","id":"documenting-what-you-did","runs":[{"text":"Documenting what you did"}]},{"t":"p","runs":[{"text":"The practice that separates restoration from alteration, and it costs five minutes:"}]},{"t":"ul","items":[[{"text":"Keep the untouched scan, named clearly, and deliver it alongside the restoration."}],[{"text":"Write a short note: “Tear across lower left reconstructed from surrounding wall. Missing corner filled with background. Colour cast corrected; original cyan layer substantially faded, so colours are approximate. Child’s face on right rebuilt partly from the second photograph supplied.”"}],[{"text":"Deliver the layered file if the client can use it."}]]},{"t":"p","runs":[{"text":"Archives and museums require this. Families appreciate it. And it protects you, because in ten years somebody will ask whether great-aunt’s brooch was that shape."}]},{"t":"h2","id":"the-free-path","runs":[{"text":"The free path"}],"role":"free"},{"t":"p","runs":[{"text":"GIMP with Resynthesizer covers structural fill. G’MIC has a large set of restoration filters including inpainting and dust removal. darktable’s negadoctor handles film negatives. Krita’s Smart Patch is good for spot work. Everything in this lesson is achievable at no cost, and restoration is an area where patience matters far more than the software."}]},{"t":"h2","id":"what-cannot-be-restored","runs":[{"text":"What cannot be restored"}]},{"t":"p","runs":[{"text":"Where the emulsion is gone, there is no image. Where a dye has fully faded, there is no colour. Where a print was out of focus, it is out of focus. Restoration recovers what survives and reconstructs what can be derived. Everything beyond that is drawing, and drawing on a photograph is a different act that deserves a different name and a sentence in the delivery note."}]}],"check":{"question":[{"text":"A 1978 family print has a strong salmon-pink cast. After correcting it with a Curves move on the red channel, the image is neutral but the colours are weak and desaturated, and pushing saturation produces noise. Why?"}],"options":[{"text":[{"text":"The scan was 8-bit, so the correction exhausted the available levels; rescanning in 16-bit would restore the colour."}],"correct":false,"tempting":[{"text":"Offers a real precision improvement that subdivides the surviving signal more finely without adding colour information that the print no longer carries."}]},{"text":[{"text":"The cyan dye layer has substantially faded, so neutralising the cast removes the imbalance without restoring information that is no longer in the print."}],"correct":true,"tempting":null},{"text":[{"text":"The correction should have been applied to the cyan channel rather than the red channel, which is why the result is weak."}],"correct":false,"tempting":[{"text":"Treats an RGB file as though it had a cyan channel: reducing red is precisely how cyan is added in RGB, so the move described was correct."}]},{"text":[{"text":"Curves applied to a single channel always reduces saturation, and a Colour Balance adjustment would have preserved it."}],"correct":false,"tempting":[{"text":"Invents a property of channel curves: a single-channel curve changes colour balance and can raise saturation as easily as lower it."}]}],"order":[3,0,1,2],"why":null},"prev":{"slug":"scanning-a-print","title":"Getting the photograph off the paper","minutes":9},"next":{"slug":"what-cannot-be-repaired","title":"Four losses that no tool undoes","minutes":9}}}