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COMPRESSING PDF FILES

To reduce file size, Acrobat gives you the option to compress contained images using either ZIP or JPEG compression algorithms. Without getting too technical, the difference between these two is that ZIP compression maintains an image's quality integrity. This type of compression is sometimes referred as lossless. JPEG compression degrades the image quality and is referred to as lossy. JPEG compression achieves smaller files than ZIP but not without sacrificing quality. Acrobat also enables you to choose None, leaving your embedded images uncompressed. This option makes your PDF files larger.

As a general rule you should try to avoid JPEG compression, especially if you are working on documents intended for print. If your document is to be displayed on screen only you may get away with a limited amount of JPEG compression without any visible loss of quality.


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