@rich o brien said:
Is it the viewport resolution or the print resolution?
It's probably both, although I have not tried printing it. What I'm doing is importing maps into SketchUp that do not have a scale in place and creating a scale bar which I then export to Layout to put in annotations.
It seems that other people have had problems with this issue and there is no solution. Importing the image directly into Layout turns out fine but importing the image into SketchUp and then exporting into Layout reduces the image quality. I will have to scale my images in Layout directly or in other software from now on.
Thanks for your help Rich, I appreciate it. All my questions were answered.