Insert Image as Large as Possible in Google Doc using App Script

I'm trying to automate putting images in a Google Doc with Google App Script. I want an image (taken from drive) to take up as much space on the page as possible. I tried to do this with...

var element = cursor.insertInlineImage(image);
      if (element) {
        //element.setBold(true);
        element.setHeight(DocumentApp.getActiveDocument().getBody().getPageHeight());
        element.setWidth(DocumentApp.getActiveDocument().getBody().getPageWidth());
      } else {
        DocumentApp.getUi().alert('Cannot insert image at this cursor location.');
      }

This causes a border on the left and bottom of about two inches. As I'm using a page with no margins, it should report the entire page size, but it's not. Is there any way to do this in Google App Script?

Thank you.