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  2. Transparency (graphic) - Wikipedia

    en.wikipedia.org/wiki/Transparency_(graphic)

    GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats.The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible.

  3. Template:Non-free no reduce - Wikipedia

    en.wikipedia.org/wiki/Template:Non-free_no_reduce

    The current resolution has been manually selected to achieve as small an image as possible without destroying the image content. According to Wikipedia's policy for non-free content, the amount of non-free work should be as little as possible. In particular, non-free media on Wikipedia should not be usable as substitutes for the original work.

  4. 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.

  5. Digital watermarking - Wikipedia

    en.wikipedia.org/wiki/Digital_watermarking

    Watermarks are identification marks produced during the paper-making process. The first watermarks appeared in Italy during the 13th century, but their use rapidly spread across Europe. They were used as a means to identify the paper maker or the trade guild that manufactured the paper. The marks often were created by a wire sewn onto the paper ...

  6. Watermark - Wikipedia

    en.wikipedia.org/wiki/Watermark

    A watermark is an identifying image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper. [1]

  7. See-through display - Wikipedia

    en.wikipedia.org/wiki/See-through_display

    A see-through display or transparent display is an electronic display that allows the user to see what is shown on the screen while still being able to see through it. The main applications of this type of display are in head-up displays, augmented reality systems, digital signage, and general large-scale spatial light modulation. They should ...

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