What size should a photo file be to print a 20x30 poster and maintain decent resolution? How about 16x20? I have a 1mb image 2592x1944. How big can I make it before it looks bad.
Hi DM,
different sites give different required resolutions.
This is from Snapfish:
Poster Size Minimum Photo Resolution Required
11" x 14" 800x630
12" x 18" 900x600
16" x 20" 1136x910
20" x 30" 1278x852
ClubPhoto:
Posters: Custom Glossy Poster
Custom Glossy Poster 16 x 20"
Min. Resolution required : 1280 x 1024
Product size : 17 x 25"
Photo size : 16 x 20"
Custom Glossy Poster 20 x 30"
Min. Resolution required : 1536 x 1024
Product size : 21 x 31"
Photo size : 20 x 30"
Custom Glossy Poster 24 x 36"
Min. Resolution required : 1536 x 1024
Product size : 25 x 37"
Photo size : 24 x 36"
You can always go to order a poster through iPhoto and when you get to the order page you will find out if the images resolution is good enough.