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Jan 25, 2018 - Open your PDF with Preview. Then go to “File > Export”. In the pop up window, expand the drop down list of Quartz Filter. Select “Black & White”. Mar 16, 2015 -Apr 13, 2018 - In Preview on your Mac, use Quartz filters to add effects or change colors. For example, you can convert a color document to black and white, or apply a sepia Apr 26, 2018 - Apr 27, 2018 - Want to preview a color PDF file in black and white or grayscale before printing it out? Prefer to read grayscale documents than colored ones? Whatever the Preview can be used to convert PDF to gray scale, plus, you can save your grayscale PDF file without needing to go through the steps of printing the document.