High resolutions (over 2400 DPI) are for viewing.
When you create PDF files intended for plotting, select a resolution to match the output of your plotter or printer. Custom black and white resolution: 400 DPI.Custom color and grayscale resolution: 200 DPI.Color and grayscale resolution: 200 DPI.The higher the resolution, the greater the precision but the larger the file size. You can specify the pixel resolution for vector and raster graphics of the PDF files that you create. You can set options, and export the sheets in a drawing to a PDF file.