Why are my files so big?

i'm no pro @ this. doing small ads, etc., , files huge when adding 1 photo relatively small photo? never had problem before.

it photo sends on top....what doing wrong? again, i'm beginner:)

define huge... if you're used working on web graphics image print resolution might appear "huge" on-target.

 

while varies depending on specific output conditions (digital press, desktop printer, offset press, etc.) widely-used catch-all image resolution 300ppi (pixels per inch) at print size. if images larger that, or if 300ppi @ large print size , you're reducing them fit ad size you're creating unecessarily large files.

More discussions in Print design

adobe