Why does home button in the UV/Image editor zoom out a lot? If you have an image in the UV/Image editor window, pressing the Home button is for View All.

Why does it put a massive border around the image?
Every time I press Home I have to zoom back in!
Zoom extents would be a lot more useful.

Is there a reason for this zoomed out border?
As far as I remember, it snaps to the same zoom ratios as you use the numpad for (1:1, 1:2, 1:4, 1:8...). This is probably to avoid any scaling artifacts since the Image Editor does not filter the images.

If you want to view the image fit to the borders better, try pressing F. However this will not set it to 1:1 if the image is smaller than the region.

Personally, I think there could be some more consistency in this regard, keeping the same hotkeys throughout editors would be nice.