Sorry for the delay in addressing this.
As I understand, the things you ask here are now resolved in our newer thread: Coordinates again .
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I show there how to align image to the center or to the left-bottom.
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I answer there what to do with left / right black margin. (it appears because your image is more panoramic than your window, so we either have to show black margins, or cut off some window part; you can do the latter by setting
Viewport.Camera.Orthographic.Width).