Film to PhotosWhat DPI to scan negatives for prints (4×6 to 8×10 and up)
The scan resolution you need for each print size from a 35 mm negative, from 4×6 to posters, with a simple table, how cropping changes it, and why 3600 dpi covers almost everything.
For prints from a 35 mm negative, scan at about 1300 dpi for a 4×6, 1600 dpi for a 5×7, 2550 dpi for an 8×10, and 3600 dpi for anything bigger or if you might crop. Since 3600 dpi covers every common print size up to about 12×18 inches and is about the real limit of home film scanners, it's the simplest choice for anything you might print.
Print size table (full 35 mm frame)
Photo labs print sharply at 300 pixels per inch (ppi); 200 ppi still looks good for larger prints viewed from a step back.
| Print size | For 300 ppi, scan at | For 200 ppi, scan at |
|---|---|---|
| 4 × 6 in | 1300 dpi | 850 dpi |
| 5 × 7 in | 1600 dpi* | 1050 dpi* |
| 8 × 10 in | 2550 dpi* | 1700 dpi* |
| 8 × 12 in | 2550 dpi | 1700 dpi |
| 11 × 14 in | 3500 dpi* | 2350 dpi* |
| 12 × 18 in | 3800 dpi | 2550 dpi |
| 16 × 24 in | 5100 dpi | 3400 dpi |
| 20 × 30 in | 6350 dpi | 4250 dpi |
Sizes marked * (5×7, 8×10 and 11×14) have a different shape than 35 mm film, which is 2:3, so part of the frame is cropped off; the numbers already account for that.
How to work it out yourself
A 35 mm frame is 36 × 24 mm, which is 1.42 × 0.94 inches. Divide the pixels you need by the inches of film you use:
- 8 × 12 print at 300 ppi needs 12 × 300 = 3600 pixels on the long side.
- 3600 pixels ÷ 1.42 inches ≈ 2550 dpi.
If you crop half the frame away, you need about 1.4 times the dpi for the same print.
Why not always scan at the highest setting?
Plustek scanners advertise 7200 dpi, but they capture roughly 3,500–4,000 dpi of real detail, so above that you get bigger files rather than sharper prints. For prints larger than 12×18, scan at 3600 dpi and let the print lab or upscaling software enlarge it; the film's grain sets the real limit. See what DPI to scan 35 mm film at.
In Film to Photos
Choose Archive (3600 dpi) for anything you might print, and save as TIFF or high-quality JPEG. Quick (1800 dpi) is fine for 4×6 and 5×7 prints and for sharing. See TIFF or JPEG?
Quick answers
What DPI do I need to print an 8×10 from a 35 mm negative?
About 2550 dpi for a sharp 8×10 at 300 pixels per inch (the 8-inch side uses the full film height). 1800 dpi still gives a good print at about 210 ppi; 3600 dpi leaves room to crop.
What DPI for a 4×6 print from a negative?
About 1300 dpi for 300 pixels per inch. Any standard setting from 1800 dpi up is plenty.
Can I make a poster from a 35 mm negative?
Yes. A 3600 dpi scan gives about 17 × 25 inches at 200 ppi, which looks good from normal viewing distance. Bigger posters work too; grain becomes part of the look.
What's the difference between scan DPI and print DPI?
Scan dpi is pixels per inch of film; print resolution is pixels per inch of paper. A 35 mm frame is about 1.4 inches wide, so a 3600 dpi scan is about 5100 pixels wide, enough for 17 inches at 300 ppi.