The safest way to digitize a fragile Hán-Nôm document is to assess its condition first, then photograph it from above while it rests in a cradle or other supports that let it open naturally. Never force a bound volume flat, feed fragile sheets through an automatic scanner, or continue when the object cannot be supported without stress. If the binding, paper, or opening is unstable, stop and ask the holding institution or a qualified book-and-paper conservator about stabilization or specialist capture.
Digitization should produce a complete, faithful access copy while the physical original remains preserved. Hán-Nôm materials can be woodblock prints, manuscripts, mixed Hán-Nôm texts, or modern typesetting, so one resolution, lighting setup, file format, or OCR expectation cannot safely be applied to every item.
Why Hán-Nôm digitization needs a preservation-first approach
Hán-Nôm refers broadly to Vietnamese materials written in Hán (Classical Chinese), Nôm (the Vietnamese character system), or both. The National Library of Vietnam and the Vietnamese Nôm Preservation Foundation describe a joint digital-library project begun in 2006 to provide access to more than 4,000 texts in the National Library’s Hán-Nôm special collection. Its project description includes woodblock printing, handwriting, contemporary typesetting, mixed Hán-Nôm pages, and occasional Quốc ngữ transliteration. Those formats belong to that named collection; they are not a complete census of every Hán-Nôm holding.
The Institute of Hán-Nôm Studies says its own digitization program began in 1998. Its institutional preservation work includes making access copies while originals remain in storage, building protective boxes for books made from soft dó paper, and carrying out repair and restoration. These examples show the central principle: digitization improves access, but it does not replace physical preservation or authorize untrained treatment.
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For background on the National Library project, see the project overview. The Institute describes its preservation activities at its institutional page.
Make the safety decision before opening the item
Ownership and access rules come first. A library, archive, temple, or family collection may require gloves, supports, a staff operator, a photography appointment, or permission before any page is turned. Ask the custodian before repositioning a unique, restricted, or damaged item.
Condition checks to perform without forcing the book
With the item closed or only gently opened, look for:
- Brittle, friable, cockled, or torn paper.
- Tears that cross text, illustrations, sewing, or a fold.
- Loose joints, detached covers, broken sewing, or a failing spine.
- Pages, wrappers, attachments, or folded sections that obscure content.
- An opening that makes text disappear into the gutter or requires force to widen.
- Scrolls, accordion books, foldouts, oversized leaves, or other formats that do not behave like a conventional codex.
The Library of Congress identifies these issues as part of item assessment and notes that some objects need stabilization by trained conservators or must be excluded from digitization until they are safe. Its assessment guidance is at Assessment of Item, with treatment considerations at Stabilization Treatments.
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Do not pull a weak binding apart to improve the view, press pages under glass, humidify a sheet, remove tape, clean a surface, or make a home repair. Those are conservation decisions. Stop if a page flakes, a joint opens, a cover detaches, a tear catches on a support, or the required opening angle cannot be achieved without pressure. Ask a qualified book-and-paper conservator or the holding institution whether stabilization or a specialist imaging method is appropriate. Exceptionally fragile objects may be safer left undigitized until a professional plan exists.
The Library of Congress states: “Don’t apply pressure to books in order to flatten them for image capture.” It explains that pressure can break the spine or loosen or break off brittle pages. Read Preservation Guidelines for Digitizing Library Materials.
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Choose a capture method that follows the object
Bound books: overhead capture with a cradle
For a bound Hán-Nôm book, use a copy stand or overhead camera system. Place the volume in a book cradle or wedges that support both sides and allow the binding to open comfortably. The camera looks down at the page; the book does not lie face-down on a scanner glass.
The National Archives gives the direct instruction: “For books, use a copy stand instead of a flatbed scanner.” Its family-digitization guidance recommends overhead capture and supports such as wedges or a cradle. See Digitizing Family Papers and Photographs. NARA’s reformatting guidance likewise says to use overhead capture for books and scrapbooks rather than forcing them flat, face-down, on a scanner: Considerations for Paper-Based Holdings.
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A loose page still needs support across its whole area. Do not let a sheet hang over the edge of a small scanner bed, especially if the paper is soft, torn, folded, or brittle. Do not use an automatic-feed scanner for fragile, weak, bent, valuable, torn, or otherwise compromised sheets. Feed mechanisms can pull, crease, or snag material before an operator can stop the machine.
Scrolls, accordion books, and foldouts
These formats require a setup that supports the portion being photographed and the portion waiting to be captured. Keep unsupported lengths from hanging, and never use the camera or a weight to force a fold flat. Oversized or mechanically complex items may need a larger cradle, staged supports, or a specialist imaging service. If the format cannot remain stable throughout the sequence, pause and obtain professional advice.
A step-by-step workflow for a safe access copy
- Confirm authority and handling rules. Record the owner or custodian, permissions, restrictions, required supports, and whether photography is allowed. Establish who can authorize a change in handling if a problem appears.
- Assign an identifier and document condition. Give the item a stable identifier. Photograph or describe the closed state, covers, spine, page edges, existing tears, detached parts, stains, folds, and missing leaves before capture. Condition notes let later users distinguish original damage from a capture problem.
- Define the capture boundary. Decide whether the project includes covers, wrappers, pastedowns, blanks, inserts, folded maps, marginalia, and every page in sequence. Completeness is an objective, not an assumption; make an explicit page-count or sequence plan.
- Build the support before placing the item. Position the cradle or wedges, camera column, lighting, and copy surface first. The support should carry the object across its format and hold the intended opening angle without a person pressing down.
- Make a low-risk test capture. Photograph a representative spread before the full run. Check focus, edge coverage, gutter visibility, glare, tonal detail, and whether the support touches or abrades the paper. Correct the setup while the item is still at the least demanding stage.
- Capture from above, spread by spread. Open only as far as the binding permits. Keep the camera square to the page plane and maintain a consistent position. Turn pages slowly by supported edges; never drag a leaf across the cradle or use a tool that could catch a tear.
- Review every image during the session. Check that no text is hidden in the gutter, no page edge is cropped, and no leaf has been skipped or duplicated. Re-capture while the book is still positioned if a frame is blurred, obstructed, or incomplete.
- Record structure and condition alongside images. Preserve the order of pages, sides, foldouts, inserts, and blank leaves. Link condition observations to the relevant image or sequence position. Structural metadata makes a digital file navigable and helps scholars understand the physical object.
- Close and return the item safely. Remove supports only after the volume is closed and stable. Return it to its prescribed enclosure or storage location, then verify that all files copied successfully before ending the session.
Image quality: aim for a faithful surrogate, not a universal number
The Federal Agencies Digital Guidelines Initiative (FADGI) identifies several objectives: complete coverage, image-quality characteristics appropriate to the intended use, structural metadata, and condition documentation. Those objectives are more useful than a single setting applied to every Hán-Nôm artifact. A delicate handwritten leaf, a dark woodblock impression, and a modern typeset page may require different lighting, focus, tonal handling, and quality controls.
The consulted guidance does not establish one universal resolution, color mode, bit depth, or file format for all fragile Hán-Nôm materials. Choose settings with the responsible institution and the project purpose, then document them so another operator can understand what was captured. FADGI’s technical guidance is available at Digitize Technical Guidelines.
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What a complete master should preserve
- The entire page or object, including edges needed to interpret its structure.
- Text in the gutter and writing near margins, without cropping or flattening.
- Paper tone, ink density, ruling, seals, sewing holes, repairs, and other evidence relevant to interpretation.
- Page order, blank leaves, inserts, foldouts, and covers when they are within the project scope.
- A stable link between each image and the item identifier, sequence position, and condition record.
Create access derivatives from a preserved master under a documented workflow. Keep the original capture separate from later cropping, rotation, contrast adjustment, deskewing, or other processing so users can tell what the camera recorded and what software changed.
Separate imaging from OCR, transcription, and interpretation
A clear photograph is not automatically a searchable text file. The project description establishes a mixture of printed, handwritten, Hán, Nôm, mixed Hán-Nôm, and occasional Quốc ngữ content, but the consulted sources do not establish a current general OCR accuracy rate across those scripts, layouts, and conditions.
Treat the stages as separate:
- Capture: produce the faithful image and its technical and structural records.
- Image processing: create documented access derivatives without obscuring the master.
- OCR: generate machine text only where the script, print quality, and layout make it useful.
- Transcription: have a qualified reader verify characters, punctuation, line order, and illegible passages.
- Translation or scholarly interpretation: identify the edition, conventions, editorial interventions, and unresolved readings.
Label machine-generated text as provisional until it has been checked against the image. A transcription should never be used to conceal a missing, cropped, or unreadable page.
Equipment choices by object and risk
The useful comparison is not “Which scanner is fastest?” but “Which setup supports this object without pressure and can produce a complete, repeatable image set?”
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| Object or situation | Safer starting setup | Reason to reject a common alternative |
|---|---|---|
| Bound volume that opens comfortably | Overhead camera or scanner on a copy stand with a cradle or wedges | A flatbed requires the book to lie face-down and may force the opening flat |
| Weak joint, tight opening, or text lost in the gutter | Book cradle matched to the opening angle; professional advice if support is insufficient | Pressing the boards or spine can cause breaks or detached pages |
| Loose but brittle or torn sheet | Overhead capture with full-area support and careful manual handling | An automatic feeder can pull, crease, or snag the sheet |
| Scroll, accordion book, foldout, or oversized item | Staged supports that carry the full format, often with specialist equipment | A small bed or unsupported overhang can bend or tear the material |
| Unstable or already damaged item | Pause for a custodian or qualified conservator to set a treatment and capture plan | Equipment alone cannot make an unsafe object safe |
An overhead book scanner with a book cradle is a relevant equipment category because it follows the support principles above. It is not a guarantee of safety: the cradle, opening angle, operator technique, and object condition matter more than the product label.
How to compare professional services
When outsourcing, ask whether the provider has qualified book-and-paper conservation expertise, how it supports weak bindings and unusual formats, whether it will document condition before and after capture, and which quality and metadata standard it follows. A low price or high page-per-hour claim is not a substitute for a method that the custodian considers appropriate.
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Troubleshooting without increasing damage
The gutter is dark or unreadable
Do not push the boards farther apart. Reduce the opening angle, improve the cradle support, adjust the camera position, or ask for specialist advice. If the text remains inaccessible without force, record the limitation rather than sacrificing the binding.
Pages move, curl, or lift during capture
Stop turning pages and check that the cradle supports the book and that air movement or operator contact is not disturbing the leaves. Do not add improvised weights, clips, adhesive, or pressure directly to the paper. Have the custodian approve any approved page-holding method.
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Pause at the first error, identify the last verified image, and recapture the affected sequence. Use a written page-order plan and review thumbnails during the session rather than discovering omissions after the item has been returned.
Glare, uneven lighting, or weak contrast appears
Adjust the light angle, camera alignment, or support before processing the image. Avoid edits that erase faint ink, paper texture, annotations, or damage. Keep the original capture so any derivative can be audited.
The object cannot be held safely at all
Exclude it from the session and document why. A responsible project may wait for stabilization, use a specialist imaging system, or leave the item uncaptured rather than create irreversible damage.
Preserve both the physical original and the digital files
Digitization creates an access surrogate; it does not end preservation work. The National Archives advises retaining originals after digitization because digital files have their own preservation risks. Store the physical item in its approved enclosure and environment, and maintain more than one managed copy of the digital masters according to the responsible institution’s preservation policy.
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Keep a record of the item identifier, capture date, operator, equipment and settings, sequence order, condition observations, processing actions, derivative names, and any OCR or transcription status. Restrict editing of the master files and preserve checks or other integrity information used by the project. If a derivative is replaced, retain the relationship to the master and explain the change.
Decision checklist before you press the shutter
- Has the custodian authorized handling and photography?
- Is the item stable enough to open at the planned angle?
- Are tears, loose parts, weak joints, and difficult formats recorded?
- Does the cradle or support carry the whole object without pressure?
- Are you using overhead capture rather than forcing a bound book flat?
- Have you rejected an automatic feeder for fragile or compromised sheets?
- Does the planned sequence include covers, blanks, inserts, foldouts, and both sides where required?
- Can you review completeness and focus during the session?
- Are master images, derivatives, metadata, and condition records kept distinct?
- Is there a clear stop point and a named conservator or custodian to consult?
What a responsible result looks like
A successful Hán-Nôm digitization project is not the one that opens a book the widest or scans the fastest. It is the one that leaves the original no worse than before, records what was and was not captured, and gives readers a dependable surrogate with enough structural and condition information to interpret it. The safer default is therefore consistent: support the object, capture from above, work within the natural opening, separate image-making from interpretation, and defer to conservation expertise when the object cannot be handled without risk.
Frequently Asked Questions
Can I scan a fragile old Hán-Nôm book on a flatbed scanner?
Not if using the flatbed requires the book to lie face-down or be forced open. Use overhead capture with a cradle or suitable supports, and ask a conservator or custodian when the binding is weak or the opening is restricted.
Should I use automatic document feeding for loose Hán-Nôm pages?
No for fragile, brittle, torn, bent, valuable, or otherwise compromised sheets. Support the full sheet and capture it manually from above.
What resolution and file format should every Hán-Nôm digitization project use?
There is no universal figure supported for every Hán-Nôm object. Set resolution, color handling, and file format according to the material, intended use, and responsible institution’s imaging standard, then document the choice.
Will OCR read handwritten Nôm accurately?
Do not assume it will. The sources describe varied scripts and formats but do not establish a general OCR accuracy rate. Validate any OCR against the image and treat transcription and interpretation as separate scholarly work.
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