how do I find the dpi of an iPhoto?

Yes, Preview can create a version of the image file with more pixels by resampling. But the resulting image will not have a better resolution than the original image. It will just have more, redundant pixels, need more storage, and the edges will be a bit blurry. The link to the online image enlarger I posted will allow to use advanced software that increases the pixel size while preserving the sharpness of the edges, without increasing the noise - quite magic. But it will take a lot of trial and error to get decent results.

and the basic answer is that you can not make a silk purse out of a sow's ear- if a photo does not have enough information you can not fix that - you can make it bigger but at best the quality will be the same as the original and most likely of less quality - there is not way to add dots that do not exist except to make them up guessing at what they might look like so there is no way to increase the pixel size of a photos once it has been taken without losing quality

LN

Denison,

to see by yourself and compare the original with the new 300 dpi version :

1-click on the Preview icon , then on the word "Preview", then "Preferences", "General", then check "Open each file in its own window"

2-back in iPhoto, export both pics to your desktop ( "IMG 2589" and "IMG 2589M" )

3-on desktop, double-click each pic: they will open in Preview, each in its own window.

You can then adjust each window to its half of the screen, and compare the photos , zoom in on details of each pic separately with the + and – signs up there in each one's tool bar.