Source: https://restorebunny.com/guides/scan-photos-for-large-prints/ # How to Scan Old Photos for Larger Prints: Pixels, Crop and PPI Work out the pixels needed for an enlargement, account for cropping, and choose a scan resolution with clear 4×6 and 8×10 examples. Scanning & preservation4 min readUpdated 06 October 2026 Quick answer ## The short version Calculate the required pixels from the intended print dimensions, then account for cropping. At 300 pixels per inch, an 8×10-inch print needs 2400×3000 pixels. Increasing a resolution label alone does not add detail. ## Start with the print, not the scanner's maximum Decide how large the finished picture will be and whether it will be held close or viewed across a room. Ask the print provider for its preferred pixel dimensions and colour requirements. The 300 PPI examples below are calculation targets for close-viewed prints, not a promise that every source needs or contains that much real detail. The basic equation is print width in inches multiplied by output PPI, and the same calculation for height. An 8×10 at 300 PPI needs 2400×3000 pixels. A 12×18 at 300 PPI needs 3600×5400 pixels. A lower-density large display can still look acceptable at a longer viewing distance; a small test print helps settle the question. ## Account for the crop before scanning A 4×6 print and an 8×10 print have different proportions. Scanning a 4×6 original at 600 PPI creates about 2400×3600 pixels. To fill an 8×10 frame without stretching, the image must be cropped to 2400×3000 pixels, losing part of the longer dimension. Check that the crop does not remove a person, a handwritten note or important surroundings. If you want the whole 4×6 image in an 8×10 print, choose borders instead of a fill crop. Stretching the picture to fit changes faces and shapes. Many disappointing enlargements are actually crop or aspect-ratio problems rather than restoration problems. ## Scan detail that the original can supply Use your scanner's genuine optical capability rather than a software-interpolated maximum. Compare a small area at two reasonable settings. If the larger file only makes paper grain and blur bigger, raising the setting again is unlikely to reveal a sharper eye or readable text. A tiny original may justify a higher capture resolution, but source focus still places a limit on the result. Keep the full scan before making print crops. If you use AI enlargement, label and retain that output separately. Newly plausible eyelashes, fabric or letters may look convincing without matching the original scene. For an important portrait, compare facial structure and recognisable marks before ordering an expensive print. ## Work backwards from a smaller original Suppose your original is 3×5 inches and you want an 8×10 fill print at a comparison target of 300 PPI. An 8×10 shape crops the source's usable image area to 3×3.75 inches. You need 2400 pixels across those 3 inches, so the scan setting is 2400 ÷ 3 = 800 DPI. The full scan would be about 2400×4000 pixels; the intended fill crop is 2400×3000. If your scanner offers 600 and 1200 optical DPI but not 800, a 600-DPI scan gives a 1800×2250 crop, or 225 PPI at 8×10. A 1200-DPI capture supplies more pixels to work with, but test whether the original contains useful extra detail. Do not force a delicate print flat to meet a pixel target. With borders, the complete 3×5 composition instead occupies 6×10 inches inside the 8×10 sheet. ## Follow a scan-to-proof checklist 1. Confirm the paper size, image area, required format and any border or bleed with the provider. 2. Check whether the original can safely be scanned complete; use a supported camera capture or specialist help when it cannot. 3. Calculate the usable crop and capture pixels. 4. Save an untouched full scan, then create the intended crop or bordered derivative. 5. Inspect the final saved file in the resolution checker and the provider's preview. 6. Order a proof and review faces, writing, edges and colour before the full order. The free print-proof worksheet provides space for these decisions. Calculators measure geometry and pixel density; they cannot predict paper, printer settings or whether an AI-generated detail matches history. ## Check the final delivery file Read the exported pixel dimensions, not only the DPI field in file information. A 1200×1500 image tagged 300 PPI still has only enough pixels for 4×5 inches at that density. Inspect the printer's crop preview, disable unwanted automatic enhancement if the service offers it, and order one small proof before a large batch. ## FAQs Does changing 72 DPI to 300 DPI make a photo printable? Changing only the metadata does not add pixels. Calculate the print size from the existing pixel dimensions and inspect a proof at the intended size. Why does my 4×6 scan get cropped in an 8×10 frame? The aspect ratios differ. You must crop part of the picture or add borders to retain the full image; stretching distorts it. How do I calculate scanning DPI for an enlargement? Divide the required output pixels by the usable source inches after the intended crop. For a 3-inch source edge filling 8 inches at 300 PPI, that is 8 × 300 ÷ 3 = 800 scan DPI. Check optical scanner support and source detail before choosing the setting. ## Sources Preservation and technical guidance reviewed for this article. - Adobe: [Set image size and resolution]() - U.S. National Archives: [Digitizing Family Papers and Photographs]() ## Related - [Check the crop and pixels for your print size]() - [8×10 portrait print calculator]() - [Inspect the exported file's resolution]() - [Download the scan-day and print-proof worksheets]() - [Calculate scan pixels and print size]() - [Choose a scanning resolution]() - [Check the quality of a restoration]() ## Ready to restore your photos? Upload an image, choose your settings, and preview results with a before/after slider. [Get Started]()[View Pricing]() RestoreBunny Team Photo restoration editors Guides follow our [editorial policy]() for sourcing, product claims, AI limitations, updates, and corrections.