Told me if I am wrong but it seems for me,
that the BlendComposite-modes GREEN & BLUE are swaped!?
If I use BlendComposite.GREEN on a blue gradient the image is getting blued.
Some other BlendComposite-modes are even not working ?
Like e.G. BlendComposite.COLOR.
I tested all Composites on BufferedImages where I fill the complete area with
a gradient paint.