To improve the image quality, go to the top menus and select SketchUp > Preferences,
Then select 'OpenGL' in the side menu and tick the 'Use maximum texture size' option.
**Please note that this may cause the computer to slow down but there should be a pop-up message which explains this.
Then use the PDF import tool.
Once you finished with using the plan, uncheck "Use maximum texture size"
**If you have PlusSpec-related questions, please use our forum.