User Profile Photos
All the photos are stored in a picture library in the root of the My Sites called User Photos. They are then stored in a folder called Profile Pictures.
You will notice there are 3 photos for each user.
Each photo is resized to fit into either 144 x 144, 96 x 96 and 32 x 32. If the photo you uploaded is a rectangle it will resize so one side is 144 pixels and the other is shorter. For example the screen shot above has George Clooney and his photo sizes are 102 x 144, 68 x 96 and 23 x 32.
Each photo is also named with a ‘_LThumb’ for the large 144 x 144 photo, ‘_MThumb’ for the medium 96 x 96 photo and ‘_SThumb’ for the 32 x 32 photo.