Delete the first line (just click on the “x” to the right of the name) You will see two options: “Image Sampling” and “Image Compression”. Click on the triangle to the left of the word “PDF Reduction”.
Now you need to change the parameters of the filter you just created. Double click on the created filter to assign a new name and call it, for example, “PDF Reduction.”. 
Select the “Reduce File Size” item, click on the triangle to the right of the item and choose “Duplicate filter”. Select the item “Filters” in the toolbar. Open the ColorSync Utility application. Read more about Apple, file size, PDF, Preview, reduce. I have a tech tip about using DropBox this way. If your PDF file is still not small enough to send as an email attachment or if you have a handful of PDFs, which collectively are too large to send as attachments, then you should consider using DropBox. This helpful tutorial explains how and also indicates subtle changes that apply to older and newer versions of Mac OS X. It turns out that one can make their own custom “Reduce File Size” filters to control the amount of image quality reduction. Please review the resulting file to make sure the image quality is satisfactory. The file size reduction is primarily achieved by reducing the quality of images in the PDF file. From the pop-up list next to Quartz Filter, select Reduce File Size. (If your Mac is using OS X 10.6 or earlier then go to the File menu and select Save As) Go to the File menu and select Export, if your Mac is using OS X 10.7, 10.8, or 10.9. (If Preview isn’t the default application, then you’ll first have to go to your Applications folder and open Preview, then drag your PDF file onto Preview’s icon on your Dock.) Open the PDF file using Apple’s Preview application. Would you like to quickly reduce the size of a PDF file so it’s small enough to send as an email attachment? Here are some easy step-by-step instructions to do this on your Mac.
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