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Help: Reducing Document File SizeIf your document contains many high-resolution images or annotations, you can reduce its file size to send, share, store, or archive more easily. PDFpen includes several ways to reduce a document’s file size. Depending on your document, you may use all or only a few of these options for reducing the size of your PDF files. Create Optimized PDFThe resolution of images and graphics increases a file’s size. Create Optimized PDF in PDFpen allows for customized downsampling of images, decreasing the number of pixels to reduce the overall file size. If your document benefits from optimization, PDFpen will create a new optimized version of your PDF.
While compression is in process, PDFpen will display a progress bar. This operation can take a few seconds or much longer, depending on the size and contents of the particular document. If successful, PDFpen will create a new untitled optimized version of your file along with dialog will with the resulting file size and amount of space saved. If the currently selected optimization settings will not save space, an “Optimization did not produce a small file” dialog will appear, and PDFpen will not create a new optimized PDF. Resample ImageUsers have an option to manually reduce the file size of scanned documents through the Resample Image option. See Scanning a Document. Resampling images typically reduces the size of an image by changing the resolution and reducing color depth. Generally, Edit > Resample Image allows you to resample a document down to 1-bit text, grayscale, or JPEG compression, and to select the dpi you want. Either can be used to effectively and considerably compress documents. Either compress a specific image, a page, or select the option to "Resample Entire Document" to reduce image sizes document-wide. Tip: There is a small trick to get resampling to work. Besides choosing a lower dpi, next to the "Color JPEG compression" dropdown menu, there should be a percentage indicator—normally choosing 50% lowers file size considerably while retaining good quality. Quartz FilterUnder File > Save As, it is possible to specify a quartz filter for document compression. See Saving and Compressing File Size. These can be customized in the ColorSync Utility application in the macOS Utilities folder. It is possible to experiment with creating different Quartz filters to see if they offer better results. Tip: There are some cases where using the Quartz can increase file size, typically with larger documents. In these cases, please contact support for further investigation. Advanced PDF CompressionPDFpen includes several built-in compression methods throughout the application, including resource compaction, such as colorspaces and fonts, to help you obtain smaller file sizes automatically. Some of the improved areas include:
Here are a few details on how they work in the background.
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