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How many megapixels for a poster

 

One of the most common questions asked in photography is “how many megapixels do I need for large blow-ups?” The answer depends on the resolution you choose. Generally, the higher resolution you choose, the better the quality of the printed image. The general rule of thumb is:

  • For output to the web use 72 dpi
  • For printing high quality photographs use a value of 200 - 300 dpi.

If you wish to send your prints to a print shop, All about Digital Photos has written a fantastic guide explaining what you will need.

 

If you are printing the images yourself, use the table below as a guide to help you choose the best resolution for your needs.

Paper Size

in mm

Pixels at 300 ppi (dpi*)

Pixels at 150 ppi (dpi*)

Pixels at 72 ppi (dpi*)

A0

841 x 1189

9933 x 14043

4967 x 7022

2384 x 3370

A1

594 x 841

7016 x 9933

3508 x 4967

1684 x 2384

A2

420 x 594

4961 x 7016

2480 x 3508

1191 x 1684

A3

297 x 420

3508 x 4961

1754 x 2480

842 x 1191

A4

210 x 297

2480 x 3508

1240 x 1754

595 x 842

A5

148 x 210

1748 x 2480

874 x 1240

420 x 595

A6

105 x 148

1240 x 1748

620 x 874

298 x 420

A7

74 x 105

874 x 1240

437 x 620

210 x 298

A8

52 x 74

614 x 874

307 x 437

147 x 210

A9

37 x 52

437 x 614

219 x 307

105 x 147

A10

26 x 37

307 x 437

154 x 219

74 x 105

Source: DIN formate faq

* DPI is short for Dots Per Inch and refers to dots per inch used in a printer. PPI is a measure of how an image is printed to a medium such as paper.

For more information about the difference between DPI and PPI as well as a list of the most common mistakes, click on the link below.

The myth of DPI

 

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