What image resolution do I need to print an 8×10 photo collage?
Asked 4/28/2018
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I’ve created several photo collages and want to print them at 8×10 inches, but I’m being told there may be a resolution problem. I’m confused about what happens when I make a large JPEG smaller, and how that affects print quality. What pixel dimensions should an image have for a good 8×10 print, and how can I tell if my file is large enough?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
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The smaller the picture is resampled, the fewer the pixels.
Image size is dimensioned in pixels. 24 megapixels might be 6000 x 4000 pixels (6000 x 4000 = 24 million). In uncompressed data, there are 3 bytes per pixel (the most common normal 24 bit color), but JPG compresses the file significantly smaller.
To print 8x10 inches at an optimum 300 pixels per inch is a size of
(8 inches x 300 dpi) x (10 inches x 300 dpi) = 2400x3000 pixels.
Fewer than that is less than optimum.
300 pixels per inch is optimum (more won't help color photo printing).
200 pixels per inch might be acceptable quality, but not best.
100 pixels per inch is considered too few pixels.
Originally by user38978. Source · Licensed CC BY-SA 4.0
user38978
8y ago
0
Generated from our catalog & community — verify before relying on it.
For printing, what matters most is the image’s pixel dimensions, not just that the JPEG file is “large.”
An 8×10 print at high quality typically needs about 300 pixels per inch (ppi). That means your file should be about:
- 8 × 300 = 2400 pixels
- 10 × 300 = 3000 pixels
So a good target for an 8×10 print is 2400×3000 pixels.
General guide:
- 300 ppi: optimal photo print quality
- 200 ppi: often acceptable
- 100 ppi: usually too low for a good print
If you reduce an image by resampling it smaller, you are throwing away pixels, not increasing them. A physically smaller print can look sharper because the same pixels are packed into fewer inches, but shrinking the file itself reduces total pixel count.
To check if your collage is large enough, look at its pixel dimensions. If it’s at least 2400×3000 pixels, it should print well at 8×10. If it’s much smaller than that, print quality may suffer.
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