Ok, what I want to do is turning out to be a little more difficult than usual.
I can find plenty of tutorials on making parts of images transparent or 
I can work out how to do this from scratch, creating an image.
The problem here is I am not creating an image from scratch - I want to take an 
existing flat image with existing background and remove background and be left 
with an image (complete with transparent and semi-transparent areas) which I 
can then save to a PNG or use on any other background I wish.

To illustrate what I want to do, I have made mockup images below.
Image 1 shows an image with a black background. I want to remove the black 
background but leave the image and semi-transparent "rays" intact so they can 
be placed onto a different background, as in image 2. Note that the "rays" 
appear over the new background colour.

image 1 http://i7.photobucket.com/albums/y265/BlackDalek/kbblack.png

image 2 http://i7.photobucket.com/albums/y265/BlackDalek/kbcolour.png

If anyone knows how to achieve this, please ellaborate. Feel free to download 
and use the above kbblack.png image to explain how to get from image 1 to image 


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