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Photoshop PDF

PDF, which stands for Portable Document Format, is the perfect vehicle for sharing images across platforms or for importing them into a variety of graphics and page layout programs. PDF is also one of only three file formats (native Photoshop and TIFF are the other two) that support an image file’s layers, meaning that layer qualities (like transparency) are preserved when you place a PDF into another application like Adobe Illustrator or InDesign. The real beauty of this file format, though, is that any document saved as a PDF file can be opened and viewed by anyone using Adobe’s free Acrobat Reader software, which Adobe bundles with its applications and makes available as a free download from its Web site.

PDF offers two compression schemes for controlling file size: ZIP and JPEG (Figure 11.2). ZIP removes whatever extraneous file information it can without the loss of any image quality and so is referred to as lossless compression. Since some degree of image fidelity is lost in the JPEG compression process, it’s known as a lossy compression. With either compression scheme, you should turn off Image Interpolation, as it tends to blur low-res images in an attempt to smooth their edges.


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