For ordinary printed family photos, start at 600 DPI if you want room to crop or enlarge later. Use 300 DPI for a same-size reprint or a smaller sharing copy. Consider 1200 DPI for a small, detailed original only when your scanner can capture useful extra detail.
That is a practical starting point, not a universal archival standard. A higher number cannot restore detail missing from a blurred print, and it does not make a file safe from loss. The original’s size, the scanner’s resolving ability and your intended output matter together.
This guide explains the settings for prints, the different demands of film, and a simple calculation you can use before scanning an entire box. For the complete workflow from sorting to backup, see our guide to digitizing old photos.
Choose 300, 600 or 1200 DPI by intended use
| Setting | Useful starting point | Main limitation |
|---|---|---|
| 300 DPI | Same-size reprints and modest screen copies | Less room for tight crops or larger prints |
| 600 DPI | Keeping a detailed master of a typical family print, with some enlargement flexibility | Four times the pixel count of a 300 DPI scan at the same dimensions |
| 1200 DPI | Small originals or demanding crops, after a sample comparison | May record paper texture and larger files rather than additional subject detail |
Before committing to hundreds of scans, scan one representative print at 300 and 600 DPI. Compare both at the same intended display or print size. For a treasured small photograph, compare 600 and 1200 DPI too. Look at faces, lettering and fine edges, rather than assuming the largest file is the sharpest.
Use the higher setting when the extra detail or cropping flexibility serves a purpose. If it adds only grain, paper texture or blur, the extra scanning time and storage may not help.
Calculate the pixels you actually need
Scanner menus commonly use DPI. For the captured image, pixels per inch (PPI) is the more precise term; printer DPI describes ink or toner dots. Pixel dimensions tell you how many image samples the file contains, not how sharp the original was.
Scan pixels = original length in inches × scan PPI. Apply the calculation to both width and height. These examples assume a full 4 × 6-inch print scanned at its original size without cropping or software enlargement.
| Scan setting | Pixel dimensions | Megapixels | Print size at 300 PPI |
|---|---|---|---|
| 300 | 1,200 × 1,800 | 2.16 | 4 × 6 inches |
| 600 | 2,400 × 3,600 | 8.64 | 8 × 12 inches |
| 1200 | 4,800 × 7,200 | 34.56 | 16 × 24 inches |
These are arithmetic examples, not measured scanner results or guarantees of visible detail. Doubling the setting doubles each side and quadruples the pixels. At 24-bit RGB, the corresponding uncompressed pixel data is about 6.48, 25.92 and 103.68 MB respectively, before metadata and file-format overhead. Compression changes the saved file size.
For an enlargement, use scan PPI = desired print PPI × enlargement factor. A 4 × 6-inch photo enlarged to 8 × 12 inches has a factor of two, so 600 PPI provides 300 PPI at the larger size. Epson’s resolution guidance explains the same relationship. If the scanner software already applies a target-size enlargement, check its settings so you do not apply the factor twice.
Use optical capture settings rather than interpolated resolution. Interpolation adds pixels mathematically; it does not recover new detail from the original. Even a high advertised optical figure does not by itself establish the scanner’s effective image quality.
Match the setting to the original
Standard prints and album pages
For a 4 × 6 or 5 × 7-inch print, 600 DPI is a useful starting point when you want to keep editing options open. For an album page, choose a setting based on the smallest photo you may crop from it, not just the page’s overall size.
Do not force a bound album flat, peel off stuck prints or feed fragile originals through an automatic feeder. The National Archives’ family digitisation guidance emphasises matching the capture method to the condition and physical form of the original.
Small or damaged photographs
A smaller print needs a higher scan setting to produce the same output dimensions. For example, a 2 × 3-inch print at 1200 PPI produces the same 2,400 × 3,600 pixels as a 4 × 6-inch print at 600 PPI. It does not necessarily contain the same detail. Ask a restoration provider what input it needs before scanning if you plan to use one.
Slides and negatives
Do not apply a print-scanning rule blindly to film. A full 35mm frame is approximately 0.94 × 1.42 inches, so 600 PPI yields only about 567 × 850 pixels. Film capture usually needs substantially higher optical sampling for a useful enlargement.
Use a film-capable scanner with the appropriate holder and transmitted light, or a suitable camera-copy setup. An ordinary reflective document scanner is not enough. Choose a resolution from the intended output dimensions and the equipment’s real capabilities; a flatbed’s large advertised DPI number alone does not prove it resolves fine film detail.
Choose colour depth and a suitable master format
For straightforward home scanning, 24-bit RGB colour is a practical starting point. Colour capture can retain sepia tones, stains and handwritten annotations in an old black-and-white photograph. If your scanner genuinely supports 48-bit RGB and your editing software can use it, that may preserve more tonal editing headroom, with larger files. Neither setting guarantees better results on its own.
| Format | Useful role | What to check |
|---|---|---|
| TIFF | Master for preservation and later editing | Select uncompressed or lossless compression, such as LZW or ZIP; TIFF can also contain lossy compression |
| JPEG | Smaller sharing and everyday copies | Repeated lossy re-encoding can reduce quality; copying the unchanged file does not |
| PNG | Lossless image copy where supported | Often larger than JPEG for photographs; check the metadata and colour-management workflow you need |
The Library of Congress’s scanning guidance discusses keeping a TIFF master and making JPEG copies for use. Existing camera JPEGs do not need conversion merely to be preserved; conversion cannot restore already discarded information.
Keep an untouched scan before applying restoration or creative edits. Review automatic sharpening, contrast and colour settings on a sample: aggressive corrections can clip highlights, exaggerate grain or alter faded colours. When preserving the original appearance matters, retain a version without those corrections.
Keep the scan usable and backed up
Check a sample at full size for missed edges, dust, skew, focus and incorrect colour before finishing the batch. Open the saved files after copying them, rather than relying only on a successful-transfer message.
Use meaningful filenames or folders and record names, dates and places where known. Keep the physical photographs too. A digital copy can make sharing easier, but it does not capture every physical detail or replace the original.
Maintain several copies in separate places. The National Archives describes a 3-2-1 approach: three copies, two different media and one copy off-site. Check them periodically. A single USB drive, computer or cloud account should not be the only home for irreplaceable photos.
Make smaller JPEG copies for email or messaging while retaining the master. AI restoration may infer or invent detail, especially in faces; preserve the original scan separately and distinguish a reconstructed image from the historical record.
Home scanning or a scanning service?
Home scanning gives you control over settings and keeps originals with you, but cleaning, positioning, naming and checking hundreds of photos takes time. A service can handle volume, although you need to assess handling, shipping and the actual deliverable.
When comparing photo scanning services, ask for the scan resolution at original size, output pixel dimensions, file format, compression and whether higher-resolution capture costs extra. “High resolution” without those details is difficult to compare.
Confirm how files are delivered, how long downloads remain available, whether originals are returned, and the complete price including shipping and optional outputs. Ask for a sample where offered. Avoid sending your entire irreplaceable collection until you understand the handling process and are satisfied with the result.
Frequently asked questions
Is 300 or 600 DPI better for old photos?
Use 300 DPI for a same-size reprint when the result meets your needs. Choose 600 DPI as a practical starting point for a master you may crop or enlarge. Test a representative photo before scanning the whole collection.
Is 1200 DPI always better?
No. It creates more pixels but may not reveal more subject detail. It is most useful for small originals or significant cropping when both the source and scanner support the extra capture.
Does changing a file from 300 to 600 DPI improve it?
Changing only the resolution label changes its suggested print size, not its pixel dimensions. Resampling adds pixels mathematically. To capture more real information, rescan the original with suitable hardware and settings.
Is a 600 DPI scan future-proof?
No single setting guarantees that. Choose useful pixel dimensions, retain an appropriate master, record what the image shows, and maintain checked backups. Preservation depends on the whole workflow.
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Stuart Kerr Spindlow is Pixoneye’s Publisher, Editor-in-Chief and Lead Product Reviewer. He tests consumer products and leads coverage of practical gadgets and personal-media preservation. His reviews focus on usability, limitations, value and the trade-offs that matter when choosing a product. Read Stuart’s full profile.
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