Question 1

What size in pixels is a 4×6 photo print?

Accepted Answer

1200 × 1800 pixels at 300 DPI. The maths is simply inches × DPI, so any size works out the same way: a 5 × 7 needs 1500 × 2100 and an 8 × 10 needs 2400 × 3000.

Question 2

Why do my prints come back cropped?

Accepted Answer

Because your photo's shape doesn't match the print's. Phones usually shoot 4:3, while a 4 × 6 print is 3:2 and an 8 × 10 is 5:4. Something must be cut, and the lab decides unless you crop to the target ratio yourself before ordering.

Question 3

How many pixels do I need for an 8×10 print?

Accepted Answer

2400 × 3000 pixels at 300 DPI. Most modern phone photos exceed this comfortably, so the usual problem with 8 × 10 prints isn't resolution, it's the 5:4 crop cutting the edges off a 4:3 photo.

Question 4

Is 300 DPI always necessary?

Accepted Answer

No. Use 300 for prints viewed up close, which covers most photo sizes up to about 16 × 20. Posters and canvases viewed from a distance look fine at 150 to 200 DPI, which is why a 24 × 36 poster needs far fewer pixels than the arithmetic suggests.

Question 5

What's the largest print I can make from my photo?

Accepted Answer

Divide each pixel dimension by 300 for a sharp handheld print, or by 150 for a poster. A 4000 × 3000 photo prints well up to roughly 13 × 10 inches, or around 26 × 20 as a wall poster.

Question 6

What size is A4 in pixels?

Accepted Answer

2481 × 3507 pixels at 300 DPI, since A4 measures 8.27 × 11.69 inches. That's about 8.7 megapixels, which most current phone cameras exceed.

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