How many pixels are needed for a certain print size, without losing image quality?

Generally, I would suggest that you do not resize the image (created by digital camera). Just give the full size image to photo lab or printer. If you are doing your own printing using inkjet printer, select the full size image and then define what print size you want in the printing software.

However, in case you really want to know the calculation, or you want your inserted images in Word document still look good in the printout, here is the general guideline.

 

Print Size
Multiply by …
Minimum Pixel Dimensions required
For colour photo print by photo lab or using inkjet printer
4” x 6”
200
800 x 1200
5” x 7”
200
1000 x 1400
8” x 10”
200
1600 x 2000
For offset print by professional printer (e.g. book, magazine, etc)
4” x 6”
300
1200 x 1800
5” x 7”
300
1500 x 2100
8” x 10”
300
2400 x 3000

For example, your desired print size of the image is about 3” x 4”. To make an inkjet print without quality loss, you need an image with minimum pixel dimensions of 600 (3 x 200) x 800 (4 x 200).

 

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