Low resolution photo prints

[stevo1210]

What's the maximum size photo print (4x 6" ?) can I make from 640x480 jpeg files that have been resized from like high resolution images from a 12mp camera?

[willawake]

Re: Low resolution photo prints

divide it by dpi. like 300 is nice 200 is good 150 is fine
640 / 300 = 2.13"
640 / 200 = 3.2"
640 / 150 = 4.26

anything below 150 is not so great quality. we use 150 for work stuff, 300 for press

if you stick a 640x480 in word it puts it at 9.03cm x 6.77 cm so 3.555 x 2.665 so it is using 180dpi as standard, same with photoshop

[stevo1210]

Re: Low resolution photo prints

Um. Sorry, but I need that in laymans terms?

[washu]

Re: Low resolution photo prints

Basically if you go below 150 DPI the photo likely won't look good. As a 640 x 480 jpeg printed at 6 inches wide is ~107 DPI, it probably won't look good. It's not a hard and fast rule though, some things might look ok.

Divide the number of pixels by the number of inches to get DPI. 640 / 6 = 106.7

As willawake pointed out, a 640 wide print at 150 DPI is 4.26" wide. So less than a 6 x 4 print.