I have used Paint.net to make a picture and it is saved as a pdn file in my computer.
But I have to convert it into a pdf file, because the printing company (that intends to do the printing) requires that I convert it from pdn to pdf.
I cannot find any easy way to do this, at least nothing obvious that I have been able to find.
Please can you advise me what is the simplest method of converting from pdn to pdf.
It is important that the picture-file does not get 'compressed' or lose quality.