LabelAtlas Spacing Margin?

Hi,

is there any way to set margin or spacing for a LabelAtlas?
Since , there are artifacts due to imprecise letter creation, I want to make a pixel border around every letter in my font image, but the LabelAtlas only accepts a fixed width and height.

This works but and I have no artifacts but there is a spacing between (additional border) the letters of the rendered text which I want to remove again.

Thanks!