I'm not sure how to remove the paper background from this logo with v9.
This is really not the same as this question, but I think similar methods apply.
Not as classy as @belisarius', but:
Perhaps it would be better would be to use Vitaliy's method, illustrated in this excellent answer. In this version, the image has a white background, not transparent (hence the difference in color, I suppose):
The value of .3 is taken from looking at a
It's actually easier than your linked question, since your ROI is monochromatic!
If you want a fully saturated image, you could do something like
In version 10 there is now a
but with some encouragement, in the form of a hint about the background's colour, or some marker positions to indicate the background, it can do even better: