Resizing images for POTY  in iPhoto (using iPhoto ’09 version 8.1.2 (424) with Mac OSX Version 10.5.8 - other versions may differ)

In iPhoto images can only be resized when they are exported.

Select your image in iPhoto, then from the iPhoto menu select File/Export
This gives you a window with various options : -

Select “Kind - JPEG” and “JPEG Quality -  Maximum”

Select “Size - Custom” and you will get options for choosing Max Width, Max Height or Max Dimension.

If your image is standard size in landscape format, you can just select “Max Dimension” and enter 1400.  This should give you an image of width 1400 pixels and height 1050 pixels.

Then click “Export” as usual.

IF YOUR IMAGE HAS BEEN CROPPED OR IS A DIFFERENT SHAPE (eg. portrait format, letterbox or panoramic), you will ALSO need to change the "Canvas size" to 1400 wide x 1050 high and colour the canvas black, or your image may not project correctly.  YOU CANNOT CHANGE THE CANVAS SIZE IN IPHOTO, so I suggest you export your image at full size and use other software to resize it and change the canvas size.

I suggest you then CHECK the size of your exported image - select it, then in the menu at the top of your screen go to “File/Get Info”. In the window that opens, under “More Info” you will see "Dimensions:  ???? x ????"  - the first figure given is the width in pixels, the second is the height. "

Many thanks to Hazel Davidson