You don't need additional software or some web-based service. The feature is built-into iPhoto. When you "export" the photo you will see a dialog box that allows you to specify the size and format of the file(s). It works well and is very fast. The image inside the iPhoto library is not changed.how can i resize my 1.5MB - 2.5MB pictures into 600k ones in iphoto so that they will go on myspace? have tried downloading software that will do this but as i have a mac my comp doesn't understand them. thanks.