How to Choose a Scan Resolution for Old Photos
By ImgHeal
Match capture resolution to the print and intended use without relying on interpolation.
Plan the output
Decide whether you need a screen copy, a similar-size reprint, or an enlargement. A small print intended for enlargement usually needs more captured pixels than a large print displayed only on a phone. Institutional projects may specify their own capture requirements.
Test actual detail
Scan a small representative area at two supported optical settings. Compare fine edges and grain at matched scale. If the higher setting adds size without resolving more source detail, it may not help that print. Distinguish optical capture from software interpolation.
Keep an unedited master
Retain the highest useful capture you can manage, then create smaller derivatives for uploading and sharing. Record the scan settings with the master. Changing a DPI metadata field later changes the suggested print scale; it does not rescan the photograph.
Before you finish
- Define the intended output size.
- Compare optical scan settings.
- Record settings with the source master.
Further reading
- National Archives: Digitizing Family Papers and PhotographsGuidance on careful digitization, file organization, metadata, and backups.
Continue with a related guide
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