dpi

The dpi parameter has two different meanings depending on the value of pageSize and pageFit. If pageSize is CUSTOM or pageFit is NONE, then dpi is the conversion ratio used to convert from units of pixels to physical inches when adding bitmap images (JPEG, PNG, or raw) to the PDF. Otherwise, if resamplingMethod is not NONE, then the image is downscaled if necessary (if the image after being fit to the page has a higher calculated DPI than dpi) to match dpi before adding it to the PDF. Otherwise, the setting is ignored and the calculated image DPI is used instead.

Default is 72