There is more than just a greyed out image involved here. First, if it's greyed out, I'm guessing it says there's an invalid location. In fact, it sounds like the package was captured on a Site Server, and that original location / site server is no longer available. Look at the location there and see if it's actually - in existence, and map to it from the SMP / NS Server to verify the NS can see it.
Other thoughts:
Is it the only image you have? Any others working? Do you have the original image file somewhere? If so, you might try to import it with the Resource import tool: \\server\deployment\task handler\tools. It will create a new resource with preferrably a new name (be sure to name it well) and that might then work.