To preserve a large mural design as a high-resolution digital reference, photograph the whole wall as a planned set of sharp, overlapping frames, keep every original frame, build a stitched master only when one frame cannot hold the detail you need, and store that master with metadata and at least one backup copy. Set the resolution from what the reference must show and at what size, not from one megapixel figure. The official digitization guidance supports this approach, but it does not prescribe one camera setup or resolution for every installed mural.
Decide what the reference has to show
The right resolution depends on what the file will be used for. A reference for close inspection, a publication image, and a large reproduction each need different detail. The FADGI pictorial-materials guidance ties master image quality to the derivatives and uses that will be made from the master, and it treats reproduction as a use case in its own right. Its discussion of exhibition murals asks whether the digital output is good enough for the job. It does not set a universal camera resolution for photographing a wall mural (FADGI pictorial materials guidance).
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| Intended use | What to decide before shooting | What it changes in the capture |
|---|---|---|
| Close-inspection reference (artists, conservators, restorers) | The smallest mark or edge that must stay readable | Sets the pixels per millimetre needed on the wall |
| Design transfer or redrawing | Which edges, proportions and lines must be exact | Requires geometry checked across every seam |
| Publication image | Largest printed size and print resolution | Sets the pixel count of the derivative you export |
| Large reproduction | Final output dimensions | Usually requires the stitched master rather than one frame |
| Condition documentation | Whether damage must be recorded at a known scale | Requires a fixed camera position and a scale reference in frame |
Write the decision down before the first photograph. It determines every later choice, including how many frames you need and whether stitching is worth the risk.
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Work out the pixel budget
Resolution on the wall is simple arithmetic:
- Pixels per millimetre on the wall = horizontal pixels in one frame ÷ width of wall that frame covers in millimetres.
- Pixels needed across a feature: a planning rule of thumb (not a figure from the cited sources) is at least three pixels across the smallest feature you must read. A 2 mm brushstroke edge therefore needs 3 ÷ 2 = 1.5 pixels per millimetre.
- Frames needed: with overlap, each extra frame adds only its non-overlapping width. A 1,500 mm frame with 20% overlap adds 1,200 mm per extra frame.
Worked example, using assumed numbers: a 6 m × 4 m mural, a camera that records 6,000 pixels across each frame, and frames that each cover 1,500 mm of wall. One frame gives 6,000 ÷ 1,500 = 4 pixels per millimetre, comfortably above the 1.5 pixels per millimetre the 2 mm feature requires. Coverage works out as 1,500 + 4 × 1,200 = 6,300 mm, which spans the 6,000 mm wall, so five frames cover it.
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Now check the print target. A 600 mm wide print at 150 pixels per inch (an example print setting, not a standard) needs 600 ÷ 25.4 × 150 ≈ 3,543 pixels across. One 6,000-pixel frame already exceeds that. For many print uses, detail is the constraint, not print size, which is why a single frame often serves a print while a close-inspection reference needs the sequence.
Prepare the site and equipment
- Confirm access and permission with the owner or the responsible institution before any setup. Record the permission in your metadata.
- Involve a conservator if ladders, scaffolding, adhesive markers or lighting heat could touch the surface.
- Use a tripod or fixed mount. Lock focus, exposure and white balance manually so they cannot drift between frames.
- Use a consistent white balance suited to the light. NARA’s technical guidance calls for this specifically (NARA technical guidelines (PDF)).
- Light the wall evenly. Glossy or varnished paint can reflect strong light as glare; if glare appears, test a cross-polarized setup on a small area before committing to it.
- Include a colour target in the first frame of each session and again whenever the light changes. FADGI describes targets as part of image quality monitoring; a target helps but does not guarantee accurate colour by itself (FADGI technical guidance).
- Place a ruler or a known-size object in frame, so measurements can be taken from the images later.
- Review images on a calibrated monitor under controlled viewing conditions.
- Do not use digital zoom. NARA notes that it interpolates a smaller captured portion into a larger file, which lowers effective resolution.
Capture the sequence
- Photograph the whole mural once at a modest setting. This gives you a planning reference and a record of the starting state.
- Mark the grid outside the artwork: use a laser level or tape on scaffolding or the floor. Do not mark the paint.
- Set the camera to manual, lock focus, choose an aperture that gives sharp detail across each frame, and fix the white balance.
- Shoot in a fixed order (for example, left to right, top to bottom) with the overlap you planned. The sources do not set an overlap percentage; 20% is an example here, not a requirement.
- At the start of each session, shoot the colour target and scale reference in place.
- Check each frame at 100% magnification on screen. Look for focus falloff, motion blur, glare and shadows from people or equipment before you move on.
- Name files by sequence so the position of each frame is clear, for example
site-north-r01-c01.tif. - Note any change in light, weather or access in a field log.
Preserve the original frames in whatever format the camera produced. If you shoot raw, keep the raw files; they are your fallback if processing goes wrong.
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Stitch and inspect the master
Stitching software finds shared features in the overlaps and aligns the frames. NARA warns that stitching can degrade image quality, so treat the stitched file as a candidate until it passes inspection (NARA technical guidelines (PDF)). Inspect it at 100% in these areas:
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- Seams: no visible step in tone, colour or detail where frames meet.
- Geometry: straight edges, cracks and architectural lines stay straight across the join.
- Edges: the outer margin is complete, with no missing corners or cropped areas.
- Repetition: no doubled or ghosted forms from people, shadows or light that shifted between frames.
- Detail: stitched areas are as sharp as the source frames they came from.
Once the inspection passes, save the stitched image as a separate master. Do not overwrite the source frames.
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Troubleshoot common capture and stitch problems
| Symptom | Likely cause | Fix |
|---|---|---|
| Visible seams with a tonal step | Exposure or white balance changed between frames | Reshoot the affected frames with locked settings; correct against the colour target |
| Straight lines bend near the edges | Lens distortion or a tilted camera position | Square the camera to the wall; apply lens correction; stitch smaller groups first |
| Soft detail in the stitched file | Out-of-focus source frames or resampling during stitching | Compare with the source at 100%; reshoot soft frames; keep the stitched file only where it matches the sources |
| Missing corners or edges | Insufficient coverage at the wall edges | Add frames that cover the edge and restitch |
| Doubled or ghosted forms | Moving people, changing shadows or shifting sunlight | Reshoot in stable light and clear the area during capture |
| Stitching fails to align | Too little overlap or low-texture flat paint | Increase overlap; use manual control points if your software supports them |
| Colour shift in one section | Light changed during the session | Shoot a target in that section and correct against it |
Keep the masters, derivatives and metadata
- Move the original frames into a folder you mark read-only, and keep them together with the stitched master.
- Save the stitched image as a master under a clear name, such as
mural-name_master_v1.tif. - Create derivatives with the purpose in the file name, such as
mural-name_web_2000px.jpgormural-name_print_300dpi.tif. - Record descriptive and technical information in a sidecar file or catalogue record: the mural’s identity and location, capture date, photographer, sequence layout, processing and stitching steps, colour target used, rights and permissions, and intended use. FADGI’s guidance on standardized metadata applies here (FADGI guidance on master files and metadata).
- Confirm that the EXIF data survived processing. The following command lists the tags in grouped form:
exiftool -G1 -a -s mural-name_master_v1.tif- Create a checksum manifest for the masters so you can detect later corruption:
cd masters
sha256sum *.tif > manifest-sha256.txt
sha256sum -c manifest-sha256.txtThe checksum step is common preservation practice rather than a requirement drawn from the cited guidance. The verify command should report OK for every file.
Store and back up the files
- Keep at least two copies of the masters, source frames and metadata on separate storage, ideally in separate locations.
- Keep the metadata and the images together, so someone who finds the files later can interpret them.
- Test a restore from the backup, not only the backup job itself.
FADGI lists long-term sustainability of masters and disaster recovery among its use cases. The sources do not recommend a backup product, storage architecture or retention period. Those decisions belong in a preservation policy suited to the owner or collection.
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Describe the file correctly
NARA states that its technical digitization guidelines describe digital surrogates for access and reproduction and are not intended as preservation reformatting that replaces original records (NARA technical guidelines). Label the set as documentation or a reference. Do not describe it as a substitute for the physical work.
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- Settled: plan the output from the intended use; cover the whole design; keep focus and white balance consistent; avoid digital zoom; keep originals alongside any stitched master; preserve metadata and backups.
- Open: a universal resolution, overlap percentage, lens, light placement, camera setting, permission rule or conservation protocol for an installed mural. The sources do not establish these, and they are not the same for every wall.
- Open: the file format for the master. The cited guidance does not name one, so choose a format your repository can open long term.
The sources are broad digitization guidance written largely for cultural heritage and archival material, not a mural-specific photography recipe. Check the linked pages for current revisions before you adopt a specific standard.
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Or skip the browser setup
Or skip the browser setup: if the reference you need lives on a web page, such as an online gallery or a digitization record, ScreenshotNeo captures that page with one request. It is a website screenshot API and MCP server, so it cannot photograph a physical wall. Use it for web-hosted references; the guidance above still applies to the wall itself.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://www.digitizationguidelines.gov/guidelines/digitize-technical.html -o shot.webpimport requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://www.digitizationguidelines.gov/guidelines/digitize-technical.html"},
timeout=90,
)
open("shot.webp", "wb").write(r.content)import { writeFile } from 'node:fs/promises';
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://www.digitizationguidelines.gov/guidelines/digitize-technical.html' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
await writeFile('shot.webp', Buffer.from(await res.arrayBuffer()));Full parameter details are in the ScreenshotNeo docs.
Why teams use it for web captures:
- Cookie banners, newsletter popups and chat widgets are removed before the shot. Each step can be turned off.
- Only clean shots are billed. Bot checks, blank pages, timeouts, failed loads and cache hits cost nothing, and each response says which it was in its X-Page-Verdict and X-Billed headers.
- An MCP server lets AI agents take screenshots through the take_screenshot, get_page_info and capture_pdf tools.
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Create a free account at https://screenshotneo.com/account/sign-up/ to get 1,000 free screenshots a month, with no card required.
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Frequently Asked Questions
Which file format should the master use?
The cited guidance does not name one. Choose an uncompressed or losslessly stored format that your repository or archive can open long term, and record the format and its settings in the metadata.
Is a phone camera enough for a mural reference?
The sources do not address phones. The same tests apply to any device: a fixed position, locked settings, no digital zoom, and a 100% check of each frame showing the detail you need before you commit to the sequence.
Quick Recap
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