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  2. Void pantograph - Wikipedia

    en.wikipedia.org/wiki/Void_pantograph

    In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied.

  3. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    Export PDF and many other formats, multi-pages and multi-layers. Supports JS forms Cannot edit PDF Files. [3] Smallpdf Desktop: Proprietary: Yes Yes Yes Yes Supports merging, splitting, and extracting pages from PDFs. Also rotating, deleting and reordering pages. Converts PDF to Word, Excel, PowerPoint, raster images. Soda PDF: Proprietary: Yes ...

  4. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    A PDF page description can use a matrix to scale, rotate, or skew graphical elements. A key concept in PDF is that of the graphics state, which is a collection of graphical parameters that may be changed, saved, and restored by a page description. PDF has (as of version 2.0) 25 graphics state properties, of which some of the most important are:

  5. Book scanning - Wikipedia

    en.wikipedia.org/wiki/Book_scanning

    Internet Archive Scribe book scanner in 2011 Internet Archive book scanner. Book scanning or book digitization (also: magazine scanning or magazine digitization) is the process of converting physical books and magazines into digital media such as images, electronic text, or electronic books (e-books) by using an image scanner. [1]

  6. Technology - Wikipedia

    en.wikipedia.org/wiki/Technology

    Technology is the application of conceptual knowledge to achieve practical goals, especially in a reproducible way. [1] The word technology can also mean the products resulting from such efforts, [2] [3] including both tangible tools such as utensils or machines, and intangible ones such as software.

  7. Energy conservation - Wikipedia

    en.wikipedia.org/wiki/Energy_conservation

    Items such as stoves, dishwashers, clothes dryers, hot water, and incandescent lighting all add heat to the home. Low-power or insulated versions of these devices give off less heat for the air conditioning to remove.

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