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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 ...
A chromogenic print, also known as a C-print or C-type print, [1] a silver halide print, [2] or a dye coupler print, [3] is a photographic print made from a color negative, transparency or digital image, and developed using a chromogenic process. [4]
Screen printing is a printing technique where a mesh is used to transfer ink (or dye) onto a substrate, except in areas made impermeable to the ink by a blocking stencil.A blade or squeegee is moved across the screen in a "flood stroke" to fill the open mesh apertures with ink, and a reverse stroke then causes the screen to touch the substrate momentarily along a line of contact.
Allied to the US Navy development of the improved lightweight overhead projector was its adaptation of the Ozalid dry printing process, developed in Germany in 1923, to copy training documents and illustrations on projection transparencies, a process simple enough to be carried out in the field and which ensured uniformity of instructional ...
The original was either a miniature 6 x 6 cm or 35 mmm colour transparency, or else a large format 5 x 7 or 8 x 10 inch colour transparency. Three separation negatives were made on panchromatic film exposing the colour transparency through a red, green and blue filter that would eventually print in the subtractive dyes: cyan, magenta and yellow ...
Eventually, print quality improved and prices decreased, and, by the 1970s, color negative film and color prints had largely displaced slides as the primary method of amateur photography. Until about 1995, color transparency was preferred for publication because of the films' higher contrast and resolution, and was widely used in commercial and ...
However, this was a two-edged sword as users with older viewers, PDF printers, etc. could see or print something completely different from the original design. The fact that the PDF transparency model is so complicated means that it is not well supported. This means that RIPs and printers often have problems printing PDFs with transparency.
The process involves a series of exposures of the polymer plate. First, it is exposed under strong light with a random dot screen placed on top of it (called an aquatint screen in fine art printing or a stochastic screen in commercial printing). Next, the plate is exposed to a positive transparency of an image.
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