An alternative way to reduce the size of PDF in a mac

I am sure you, like me, have had the need to reduce the file size of a PDF. Take for example the occasional need of sending a PDF by email just to find out that the size is such that the message is rejected. I have used Adobe Acrobat Pro to help, but recently I came across an alternative way of achieving this: Use Colorsync Utility in a mac. Here is how:

1. Right click the PDF that needs reducing and select “Open with…”
2. Select Colorsync Utility and wait for the application to open the file
3. At the bottom of the status bar in the application, you can now select one of the quartz filters available
4. Press “Apply”
5. and voilà