By Peggy Fitzpatrick and Paul Biedermann...
Today Google+ made an update and changed all the sizes for your profile images. The new art required is broken into three definitions and sizes:
1. Profile picture — larger than before with a minimum upload of 250 pixels X 250 pixels and a recommended format of jpg or png.
2. Cover photo — a large panoramic style photo that goes behind and extends past your profile picture on the right side. This new format ties the images together nicely, making a lot of impact. It can also create a beautiful branded image for you and/or your company. The size is 940 pixels X 180 pixels and the recommended format is either jpg or png.
3. Scrapbook photos — these can either be five individual photos or one large photo cropped into individual squares that are 110 pixels X 110 pixels. The recommended format is jpg, png, or gif.