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Modify PDF files with Quartz filters in ColorSync Utility on Mac
You can use Quartz filters to modify a PDF document by adding effects, changing the colour space and even reducing the size of the file by recompressing graphics.
In the ColorSync Utility app
on your Mac, choose File > Open, then select a PDF document.When the file opens, click the Filter pop-up menu at the bottom of the window, then choose a filter.
The effects of that filter are reflected in the window, but the file is not modified.
To step through the pages of the PDF document and see the filter effects on each page, use the navigation arrows in the toolbar.
To view available filters, click the Filters button
in the toolbar.Click Apply when you want to save the changes.