iPhoto How to "UNZIP" from ED

Greetings, I posted this a while ago, but the only response didn't work ("double click on the photos." ? Nope) ... & there was no way for me to reply to it.

I've also been looking through every "manual" & every "help" & most every discussion on iPhoto that's here, but so far, nada answers. So, here goes.

My Problem - How do you UNZIP photos uploaded from an External Drive & a USB... Is there a way to do so, or am I stuck with the small dpi?

In May 2012 my wonderful, first, Mac Desktop, Tiger ('06) crashed. It was like I Lost my baby! Alas, I had to get a new one - a 17" Lion Desktop. & I uploaded all those saved documents & photos from a USB & External Drive (I won't go into those not saved & lost forever, or the duplicate photos, AGUH! now fixed.)

But - as I uploaded these back ups - I didn't see anything about Un-Zipping photos before or while they were being uploaded . ? . So every photo uploaded - came in Zipped, with dpi of between 200s - 300s to 500s x 700s - sizes that don't print or send via E-mail or the Net very well (that same fella said his photos were "never zipped" to his USB or ED! . . . Well, all mine were zipped!) The only thing I do know - is that it was not my Camera (Cannon PowerShot A590) which I had set the dpi between 1600s x 1900s & some at 2500s x 1900s dpi.

Please, is there anyone with any ideas out there that might work?

Mille Grazie, go raibh maith agat, Gracias, Danke, Merci, Obrigado, Σας ευχαριστούμε, Dank u, Vielen Dank, Bedankt, Kiitos, Tak, Tack, Takk, Спасибо, Вы, 감사하십시오, ありがとう, ありがとうございます, 謝謝,

Thank You a thousand times over to anyone who can really help me ; > }

PS, to prevent this mishap again, I don't delete any photos from memory cards! I'm using them as The Back Up & get new ones as needed!