"Some photos need to be prepared to view them at full size" message when starting slideshow

I'm pretty new to iPhoto so I'm sorry if these questions are obvious to you, but they're not to me!
From the "Photos" section on iPhoto, with no photos selected, I accidentally started a slideshow with all my photos by pressing the play button on the keyboard and got this message:
"Some photos need to be prepared to view them at full size. Do you want to continue using the current size or prepare the photos so that only full size images are used? This may take some time." With these options: Cancel / Prepare Photos / Continue Playback.
I pressed "Esc" on the keyboard and it clicked "Prepare Photos" instead of "Cancel" as I expected, it started the process and I clicked "Cancel" to stop it, and the slideshow started. When the slideshow was playing, everything froze, I pressed cmd-alt-esc, no window appeared and iPhoto quit immediately. Could it have caused damages to the library? Could it be a reason to restore the iPhoto Library from Time Machine? I didn't get any error message when I reopened iPhoto.
Not to leave the process incomplete later I decided to start another slideshow and this time I clicked "Prepare Photos" and let it complete the process. Now when I start another slideshow I don't get that message anymore.
I have no idea what this process did to my photos and couldn't find an answer anywhere. This library is very important to me, so I'm wondering if I should restore the iPhoto Library from a Time Machine backup.
Could canceling the process the first time have caused any damage to my photos?
What is this preparation? What did it do to my photos? Have my photos been resized, or somehow modified?
Thanks

Ok, thank you very much. I still don't know exactly what the "preparation" did to my photos but now I guess that nothing bad happened. Thanks

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