423b5459__Students_at_College_of_DuPage__definition
[file extension] pdf (pronounced as separate letters) [acronym meaning] Portable Document Format by Adobe Acrobat [definition] 
Identical to PostScript pages, PDF files can represent both vector and bitmap graphics, and can contain electronic document search and navigation features such as electronic links. Photoshop PDF format supports RGB, indexed-color, CMYK, grayscale, Bitmap, and Lab color modes, and does not support alpha channels. The format supports JPEG and ZIP compression, except for Bitmap-mode files, which use CCITT Group 4 compression when saved as Photoshop PDF. When you open a PDF created by another application, Photoshop rasterizes the file.
Graphic File Formats for Digital Imaging Students at College of DuPage
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