How can I change resolution from 72 ppi to 144 ppi?

Adobe's CS allows me to change the resolution of an image from 72 ppi to 144 ppi (Image | Image Size). Does iPhoto have a similar capability? Terence Delvin has previously posted how to resize an image to a specified dimension (iPhoto 8 | Installing | Resize), but I also need to change the resolution. iPhoto is so wonderful it's a shame to have to export a file and open it in CS if this is all I wish to do. Thanks, in advance.

BPWMorro wrote:
Seriously, it is a photo competition where digital images are displayed through a computer/digital projector setup. The organization's requirements (not mine) are 1024 pixels on the longest side and maximum 144 ppi. Adobe resizes like this in both the CS and also Elements and when the file is then saved it keeps the 144 ppi and its size decreases (for example, from 3.22MB to only 751KB). I just would like to make my life simpler and use iPhoto to accomplish the resize.
OK I see. I am still confused as to their requirement of 144 ppi as the 1024 on the longest size will resize down for you.
I don't think iPhoto can change the ppi but you can resize down. Pick the photo, go to File -> Export... and then under size pick custom. On the pull down if you pick "dimension" then type in 1024 in the box under that, it will automatically output a new version of your photo with 1024 as the max size and you get a nice smaller file.
However, the PPI setting remains the same since this is a print setting and when displayed on a monitor or digital projector, it will display at exactly 1024 by whatever the other side is, assuming the program displaying it displays at 100%.
Let me poke around a bit more and see if I can come up with something.
Perhaps a simple exif editor (rather than having to open it in Elements or CS) that you can quickly change the PPI setting of the exported image. I'll have to look and see what is available.
Patrick

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