It seems like the “Resolution” box in the Options box for exporting images is not working as expected. It is supposed to work in tandem with the image size option and should have only allowed one or the other option to be entered. Currently, the “Resolution” box has no impact on the quality of the image, and in fact, this option is not available on Windows version of SketchUp.
Since SketchUp exports a digital image the DPI does not apply to it. Instead, the number of pixels decide the quality of the image. So, to get the desired resolution image on the paper, use the paper size and the ppi to get the pixel size. For e.g. if you want to print a 300 PPI on a “Arch D” paper then the image size should be set to 30024 X 30036 pixels, OR 7200 X 10800 pixels.