User blog comment:CitizenA/Paint.NET silhouette plugin/@comment-24.184.105.92-20130327060430/@comment-5906821-20130403001056

Ah, I think I see the problem. Thing is, I think MGQ actually always anchors 0,0 as being on the left. Since your picture is less wide than the game's resolution, it shows up on the left side. I guess in your other method your picture was the game's resolution size and centered in the actual image, so it showed up in the center of the game at 0,0.

An easy way to solve that is to simply resize the canvas to 800X600, center the sprite yourself, then double the width and apply the effect. A bit of a pain, I know, but sadly you can't muck around with the canvas size in a plugin, so there's nothing I can do on my end. Anyways hope that helps, and best of luck on your scenario!