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You can select the new filter from the Quartz Filter menu.
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The Mac's default screen resolution is 72dpi, so if the PDF is only going to be viewed on your system then this may be an appropriate size however, if you are planning on printing or zooming in on images then a higher resolution will be more appropriate. Now give this new key the desired pixel resolution such as 72, 150, or 300, and set the scaling factor and minimum and maximum fields to zero. If you are using a text editor, then create a new key-and-value pair and place it within the "dict" tags of the ImageScaleSettings field, and then edit it so it looks like the highlighted text in the following image: Add this key and value pairing to be able to set all images to a specific resolution. If you are using a property list editor, then you can do this by selecting the ImageScaleSettings field and then adding a new child field with the name "ImageResolution," and setting this field's type to be a Number. To do this, you will need to create a new property field in the file called ImageResolution. These options collectively adjust images relative to their current sizes, but another option is to forgo any relative adjustments and set all images to a single resolution. The default range in Apple's filter is 128 to 512 pixels, but you can change this to whatever you would like. This will make them grainier, but significantly reduce their file sizes.Īlong with this are the ImageSizeMax and ImageSizeMin settings, which limit the resolution range, this time in direct pixel values. The ImageScaleFactor setting is the resolution adjustment ratio, which in Apple's filter is 0.5 to reduce the resolution by half, so if a PDF has two images that are 500 and 300 pixels across, they will be resampled to 250 and 150 pixels. The file's settings will be listed by fields and values in Apple's Property List Editor program. The first of these settings is ImageCompression, which will adjust the overall quality of the resulting image in a range of -1 for greatest compression to 1 for least compression.
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If you are using a standard text editor, then you will see the paired key-and-value XML formatting of this document, but the hierarchical structure will be the same. If you are using a property list editor, then you can expand the Root > FilterData > CoreSettings > ImageSettings fields where you will be able to adjust the values for ImageCompression, and then expand the ImageScaleSettings field to access the image-scaling factor, and size maximum and minimums. Next, open the file with your property list editor or text editor program, where you can adjust some of the settings.
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TextWrangler and some other text editors are available from the Mac App Store.įirst, go to the Macintosh HD > System > Library > Filters folder and copy the file called "Reduce File Size.qfilter" to your Desktop.
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To do this, you will need a good text editor such as TextWrangler, or a property list file editor such as PlistEdit Pro or Apple's Property List Editor that was included as a component past versions of Xcode (though no longer included with the development suite). However, if necessary you can adjust the settings manually, or even create your own set of filter settings to use. The settings in a text editor will appear in their XML formatting as key and value pairings.Īpple does not offer any settings for fine-tuning this filtration process.
These compression routines are done by adjusting the embedded image quality of the PDF, so if you have a PDF with many large, high-resolution images in it then it will show a greater reduction in size than one with only a few, lower-quality images.
A Quartz filter can be used to reduce the PDF's file size, but while it's effective at doing so, you may find images in the resulting PDF too grainy to use. One of its features is support for Quartz filters, which can be applied to PDFs and image files to convert them, for example into sepia, black-and-white, or gray scale. Apple's Preview program is the default PDF viewer in OS X, and has a number of options for annotating and otherwise managing PDF files.
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