Color Printing
Color printing furnishes reproduction of images and text in color, which cannot be created in monochrome printing processes. The method is also referred to as four-color procedure printing when only CMYK, i.e., cyan, magenta, yellow, and black are used while printing. Six-color process printing is another method of color printing too involves addition of orange and green shades to the traditional CMYK color scheme, making possible other vibrant color combinations.
However, a line of steps are involved in the color printing process to generate a quality color reproduction. Color separation is the several primary step, which is accomplished with the make it easier for of digital imaging technology wherein the original artwork is digitally scanned and separated into red, green, and blue components. Digital imaging technology has been very important in faster and higher quality color separation. The process has eliminated the drawbacks of the traditional method, that was to photograph the image three times, and then a different filter was used for every color.
After separation, the images are inverted, and then, by black separation, an image amid better contrast and shadow is reproduced. The final step is screening of the image in required colors.
The Stochastic screening method is the newly written process in this direction, that greatly facilitates in eliminating the dots that are generated by the traditional half-tones screening processes.
Color printing can be reproduced with the help of various printing techniques, these types of as offset lithography, screen-printing, digital printing, flexography, and gravure. The offset lithography is done mostly by all printers and is considered one of the main methods. On the other hand, screen-printing is the most popular process and is useful in a variety of printing operations. The technique is mainly useful for printing flat surfaces and can print on everything from paper to metal. Digital printing is another process who is becoming very popular and delivers seamless color prints.
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Until photography became the preferred method of documenting history toward the end of the nineteenth century,?
Until photography became the preferred method of documenting history toward the end of the nineteenth century, lithography, intaglio, wood block printing, painting, and other “variations” of drawing gave visual representation to history. While it seems that we should be able to better trust the objectivity of photography more so than these early forms, we do not. Why is this?
Until photography became the preferred method of documenting history toward the end of the nineteenth century ?Photographic processes improved during all the nineteenth century. So at the end people were able to better trust the objectivity of photography.—– Photography as a usable process goes back to the 1820s with the development of chemical photography. The first permanent photograph was an image produced in 1825 by the French inventor Nicéphore Niépce. However, because his photographs took so long to expose, he sought to find a new process. Working in conjunction with Louis Daguerre, they experimented with silver compounds based on a Johann Heinrich Schultz discovery in 1724 that a silver and chalk mixture darkens when exposed to light. Niépce died in 1833, but Daguerre continued the work, eventually culminating with the development of the daguerreotype in 1837. Daguerre took the first ever photo of a person in 1839 when, while taking a daguerreotype of a Paris street, a pedestrian stopped for a shoe shine, long enough to be captured by the long exposure (several minutes). Eventually, France agreed to pay Daguerre a pension for his formula, in exchange for his promise to announce his discovery to the world as the gift of France, which he did in 1839.
Meanwhile, Hercules Florence had already created a very similar process in 1832, naming it Photographie, and William Fox Talbot had earlier discovered another means to fix a silver process image but had kept it secret. After reading about Daguerre’s invention, Talbot refined his process so that portraits were made readily available to the masses. By 1840, Talbot had invented the calotype process, which creates negative images. John Herschel made many contributions to the new methods. He invented the cyanotype process, now familiar as the “blueprint”. He was the first to use the terms “photography”, “negative” and “positive”. He discovered sodium thiosulphate solution to be a solvent of silver halides in 1819, and informed Talbot and Daguerre of his discovery in 1839 that it could be used to “fix” pictures and make them permanent. He made the first glass negative in late 1839.
In March 1851, Frederick Scott Archer published his findings in “The Chemist” on the wet plate collodion process. This became the most widely used process between 1852 and the late 1880s when the dry plate was introduced. There are three subsets to the Collodion process; the Ambrotype (positive image on glass), the Ferrotype or Tintype (positive image on metal) and the negative which was printed on Albumen or Salt paper.
Many advances in photographic glass plates and printing were made in through the nineteenth century. In 1884, George Eastman developed the technology of film to replace photographic plates, leading to the technology used by film cameras today.
In 1908 Gabriel Lippmann won the Nobel Laureate in Physics for his method of reproducing colors photographically based on the phenomenon of interference, also known as the Lippmann plate.
http://en.wikipedia.org/wiki/Photography#History
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