How do you smart scissor a image on gimp and cut the background off?

I have a grey scale jpeg, and I want all the white to be transparent so I can put a background behind it and just have the black/grey part of the image stand out.





I've tried using the smart scissors, but I can't seem to get them to pull the white off the image.





How do I do this in GIMP?|||If you want ALL of the white to be transparent...


1) Go to Layer%26gt;Transparency%26gt;Color to Alpha and, if white's not already the chosen color, change the color to white.


If you want a certain white region to be transparent...


1) Go to Layer%26gt;Transparency%26gt;Add Alpha Channel


2) Use the Color Select to select the particular region


3) Hit delete


4) Rinse and repeat for all applicable regions.|||For transparency:


Use fuzzy select on the white places then go to layer to transparency.


Click on on add alpha channel and click clear.