Troubleshooting
Why does my photo print look blurry? Check these five things
Distinguish low effective PPI from missed focus, compression, crop losses and print settings before you try to fix a soft print.
A PPI result can explain a shortage of pixels, but it cannot diagnose focus or sharpening. Check the actual export and final crop before changing resolution settings.
1. Check the file you sent
Start with the attachment or export that reached the printer, not a better original elsewhere on your device. A messaging service, screenshot or export preset may have reduced the dimensions. A 1200 × 800 landscape file placed at 12 × 8 inches supplies 100 PPI; a 3600 × 2400 file at that size supplies 300 PPI.
Compare those values with the provider’s recommendation. The first file contains fewer samples per inch, but neither number alone proves how the print will look. Keep a record of the sent file’s dimensions so you can distinguish an export problem from a printing problem.
2. Calculate the density after cropping
A useful-looking full-file pixel count can hide a heavy crop. For example, a 3000 × 2000 landscape image filling an 8 × 10 portrait print retains a centered 1600 × 2000 area. That finished crop is 200 PPI. Dividing the original width by 8 would give a misleading value for this fill placement.
Check the actual orientation and fit/fill setting in the print order. If the important subject occupies a small part of the original, enlarging only that part can use far fewer pixels than the camera’s original file dimensions suggest.
3. Inspect focus and compression
Look at the final image in an editor at a view that reveals individual image pixels. Search for motion streaks, missed focus, blocky edges and halos around high-contrast details. A file can be large enough for the target dimensions while those defects remain visible.
Changing resolution metadata will not fix them. A new export from a better source can avoid damage introduced by an earlier export, but it cannot recover information that was never recorded. Compare before and after versions instead of trusting a file-size increase as evidence of improvement.
4. Review the output settings
Confirm the selected paper size, orientation and placement mode. An unexpected “fill page” setting may enlarge the image beyond the size you calculated. A borderless option may include an additional crop. Your print provider’s actual workflow determines what happens after you send the file.
For home printing, use the printer’s documented paper and quality settings. The advertised printer DPI is not a substitute for your image’s effective PPI. Paper suitability, ink behavior and processing can affect the result, but our dimension calculator does not diagnose those physical causes.
5. Test at the intended scale
Before ordering another large print, examine a proof or print a representative crop at its final physical scale. Reducing the entire image onto a smaller sheet increases its density and can conceal the very problem you want to assess. Choose an area with fine detail and another with a smooth tone if both matter.
Change one factor at a time and retain the original result for comparison. Record the source dimensions, finished size, crop and settings. If the dimensions meet the provider’s specification yet the output remains poor, those notes make a support conversation more useful than saying only that the file is “300 DPI.”
Sources & further reading
These references support the definitions. The calculations and examples in this article are original; printer-specific requirements must be checked with your provider.
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DPI Calculator
Calculate the DPI (PPI) of an image at your print size: DPI = pixels ÷ inches. Choose a local image or enter its pixels, then compare fit versus crop.
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