The purpose of preview is the extraction of selected elements from a LaTeX source, like formulas or graphics, into separate pages of a DVI file. A flexible and convenient interface allows it to specify what commands and constructs should be extracted. This works with DVI files postprocessed by either Dvips and Ghostscript or dvipng, but it also works when using PDFTeX for generating PDF files.
Currently, preview.sty is used by preview-latex, the WYSIWYG component of the AUCTeX editing environment; for generation of previews in LyX; as part of the operation of the ps4pdf and pst-pdf LaTeX packages; by the tbook XML system and some other tools.
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