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PDF is an image description format, nothing more.Um, wrong. PDF is a subset of Postscript, and it can contain text (rendered in the native system's fonts) as well as image data. It can also contain "marked-up" portions of the image, that are rendered as images, but have text associated with them (so you can copy and paste outside the PDF by selecting a part of the image as you would a block of text).
Score:2, Informative