How can I create a poster using iPhoto?

That is not a feature of iPhoto - suggest to Apple - iPhoto Menu ==> provide iPhoto feedback

.

ask the print service that you are going to have print the poster how they suggest preparing it

LN

If you have Pages you can create a collage with it easily. Create a custom layout the size of the poster you want. Open iPhoto and drag the photos you want into the open Pages layout, resize and place where you want.

When you have the posted completed do a Print ➙ PDF ➙ Safe as PDF to create a pdf file of the poster. Most photofinishers like Kinkos can print pdf files.

This 96 photo collage, 20x30, was created that way:

Which I will do. Can anyone help me with how I can also have a very large poster created of all the images too please? Or can i print the pages individually perhaps?

A simple work-around in iPhoto: Some iPhoto book themes let you create a layout of up to 16 photos.

• Create several book pages with a borderless layout and print these pages to PDF, with the option "PDF > Save PDF to a folder as JPEG"
• Then import these JPEG patches again as photos and arrange them side-by-side on a new book page.

This way, you can create a book page with up to 16x16 photos and print it to PDF.