How can I recover photos from iPhoto app?

Which system is currently running on your Mac? And which version of iPhoto has last opened the libraries?

• If you are having a version of iPhoto 9.6.1 installed, you can run it on OS X 10.103 to macOS 10.14.x to open iPhoto Libraries from iPhoto 9.x or iPhoto 8.x.
• If you have macOS 10.15 up to macOS 12 you can open iPhoto Libraries Photos for Mac, but only iPhoto Libraries from iPhoto 9.x or iPhoto 8.x. Older iPhoto Libraries will need to be prepared with the iPhoto Library upgrader tool, and this tool requires macOS 10.14 or earlier. We can no longer use it on macOS 10.15 Catalina or later.
• On macOS 13 Ventura or later it is no longer possible to open iPhoto Libraries in Photos. But we can now import iPhoto Libraries into an existing Photos Library. This will import the media (image files, video files), but the albums and folders and events will be lost.

If you cannot get to the library images fro Photos, as a last resort you can recover the original files from within the Library package.

Note: this is a last resort action. You will recover the images as you imported them from the camera. You will lose any edits, metadata changes or organisation you have done.

Right click on the Library package and select 'Show package Contents'. A Finder window will open within the library. Your images will be inside a folder called 'Originals' or 'Masters' (the name varies on the version. Drag them from there to wherever you prefer.

Can I confirm that you're asking specifically about iPhoto (an app discontinued almost 8 years ago) and not Photos, the current photo manager on Mac OS?

Can you give us some background? How are you trying to recover the images? What happens when you try to recover images?

And is the system version given below your question still the system you are having currently installed? iMac 27″, macOS 10.13. ? On this system version you could still be running iPhoto. But you need iPhoto'11, version 9.6.1.