Hello. I got a couple of pdf files to send by email. Most files are about 1.5M. One is 4.5M. I know that one could reduce the file size via Preview or Colorsync. However, after the filtering, the file size either remains to be the same or only reduced insignificantly. Yet, the quality often goes very poorly. Is there a good way to reduce the file size (e.g. 4.5M to about 1M) without scarifying the quality? Thanks.