PSB's and Layer Positions

Hey guys, I'm importing a PSB file from photoshop to Unity which is 1466x912. When it's being imported I'm using

Code (CSharp):

1. OnPostprocessSprites(Texture2D texture, Sprite[] sprites)

so I can inspect the sprite data for each layer.

When the PSB has imported, I drag it from the project window into the hierarchy. Each layer is a seperate object, has a local position and it all looks correct, but how does it calculate that local position? I assumed I'd be able to find this data in the sprite data but it's x and y co-ordinates seem completely wrong (though it's size and pivot are as expected). For example:

• a layer/sprite that's 119x109 and is positioned in the top left of the image has an x position of 1478 and a y position of 121.
• a layer/sprite that's 119x109 and is positioned in the bottom right of the image still has an x position of 1478 but a Y position of 472.

It doesn't seem to make much sense....any ideas?
Thanks