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Document comparison, also known as redlining or blacklining, is a computer process by which changes are identified between two versions of the same document for the purposes of document editing and review. Document comparison is a common task in the legal and financial industries. The software-based document comparison process compares a reference document to a target document, and produces a third document which indicates (by colored highlighting or by differing font characteristics) information (text, graphics, formulas, etc.) that has either been added to or removed from the reference document to produce the target document. Common documents formats for comparison include word processing documents (e.g. Microsoft Word), spreadsheets, presentations (e.g. PowerPoint), and Portable Document Format (PDF) documents. ==Overview== In the broadest definition, document comparison can refer to any act of marking changes made between two versions of the same document and presenting those changes in a third document via a graphic user interface (GUI). There are several variants in the types of changes registered through the process of document comparison. Some programs limit comparison to solely text and table content in word processing documents, while others register changes made in spreadsheets and presentations, along with changes made in versions of PDF documents. Certain programs also exist that compare changes made to objects like JPEG, TIFF, BMP, PNG images embedded in documents, and plain text files. Document comparison solutions mark changes made to the following types of documents: It is common for document comparison software vendors to present forms of the compared document in separate windows in a GUI, so that each window contains the following items and the various windows are displayed on one or more computer display monitors: the original document, the modified document, and the redline (or comparison) document, with a fourth window used to present the list of changes made between document versions. Presentation of changes made between document versions are also traditionally customizable. While the standard display of showing deletions with red underlines and additions with blue underlines is still used by many document comparison products, some offer the ability for users to customize the presentation of changes in the redline/comparison document. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Document comparison」の詳細全文を読む スポンサード リンク
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