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They protect paper documents from tears, water, food, stains, and fingerprints, and partially prevent such documents from being crumpled. Punched pockets have several holes in the left edge, which allow them to be bound into a file folder or ring binder. The holes in the punched pockets dispose of the difficulty of making holes in a paper document.
In addition, transparency is often an "extra" for a graphics format, and some graphics programs will ignore the transparency. Animated PNG 8-bit transparency. Raster file formats that support transparency include GIF, PNG, BMP, TIFF, TGA and JPEG 2000, through either a transparent color or an alpha channel.
PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF)—unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF". [ 6 ] PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and ...
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Sheets of perforated paper. Perforated paper is a craft material of lightweight card with regularly spaced holes in imitation of embroidery canvas. It is also sometimes referred to as punched paper. Perforated paper is most commonly embroidered with cross stitch motifs and borders. Typical uses for such items include ornaments to decorate ...
Transparencies can be printed using a variety of technologies. In the 1960s and 70s the GAF OZALID "projecto-viewfoil" used a diazo process to make a clear sheet framed in cardboard and protected by a rice paper cover. [1] In the 1980's laser printers or copiers could make foil sheets using standard xerographic processes. Specialist ...