Exporting map as image

I would like to export a whole map (ARK) as a top-down high-resolution image (e.g.: topographic map).
I tried the HighResShot function, which works for a screenshot-size-multiplier of 1, but when using more than 1 only a black area is added around the map (I did specify the region for the screenshot).

Is there a better solution instead of the HighResShot? If not, how do I increase the resolution for the same area instead of having a black area around it.

HighResShot with multiplier: 1
HighresScreenshot00003 - Copy.png

ighResShot with multiplier: 2
HighresScreenshot00004 - Copy.png