Need help fading outside of ellipse to black

[King Mustard]

I want to get this image printed on a black t-shirt.


The blue effect on the background of the image, which I want to keep, stretches beyond the outside of the image so if it was printed, you'd see a box around it and it would look ugly on the t-shirt.


A solution, to me, would be to drawn an ellipse around the image and fade the outside of the ellipse slowly to black but I don't know how to do this.


Any suggestions?

 

[MrToM]

A simple 'vignette' would do that.

You don't say what PS version you are using so a quick search for 'photoshop vignette tutorial' in Google would be your best bet.

Regards.
MrToM.