I used Noggin 1.1 und Pixture reloaded 3.0-RC1.
After Read all threads about it und use #header .header-inner selector i can use a image.
But some works not the theme runnung by max width 1260px an the headerimage from noggin
have on different settings on left,right or both sides of the head a part of the standard header.
It not possible to strech the image to the full width.
And change of the height is impossible too.
I hope it give any idears.