The Export Bitmap Command, basically is able to edit everything from height, zoom, map-scale, scale, dpi, etc.
For more info you can use this site:
maperitive.net/docs/Commands/ExportBitmap.html
Hope this helps!
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Answer:
I MEAN, im no whor.e but..... yeah
Explanation:
B.) By first painting the canvas white
Hope this helps chu
Have a great day