How do I know if an image will come out pixalated before I print it out?

Meli

New member
I am trying to print out 4x6 images
I saved the files off of facebook from my page or friend's pages and I am concerned that the file size might be too small
I have a mac and use preview so when I click get info I can see:
Size of file
Dimensions
Color space
What do I base it on?
Thanks but I am still confused are the dimensions the resolution??
 
Ok, abit of an add to Selina's answer. Dimensions is pixel dimension so it will be something like 800x600 or whatever. Resolution on photos from facebook and most other websites is 72dpi. You can use Selina's formula's to calculate print size from there. Also the resolution of your printer itself will matter but pretty much any printer can handle 72 dpi since office charts are often printed at around 150-200dpi.
 
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