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Halftone
Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect.Campbell, Alastair. The Designer's Lexicon. ©2000 Chronicle, San Francisco. "Halftone" can also be used to refer specifically to the image that is produced by this process. Where continuous-tone imagery contains an infinite range of colors or greys, the halftone process reduces visual reproductions to an image that is printed with only one color of ink, in dots of differing size ( pulse-width modulation) or spacing (frequency modulation) or both. This reproduction relies on a basic optical illusion: when the halftone dots are small, the human eye interprets the patterned areas as if they were smooth tones. At a microscopic level, developed black-and-white photographic film also consists of only two colors, and not an infinite range of continuous tones. For details, see film grain. Just as color ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halftoning Introduction
Halftone is the reprographic technique that simulates continuous-tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient-like effect.Campbell, Alastair. The Designer's Lexicon. ©2000 Chronicle, San Francisco. "Halftone" can also be used to refer specifically to the image that is produced by this process. Where continuous-tone imagery contains an infinite range of colors or greys, the halftone process reduces visual reproductions to an image that is printed with only one color of ink, in dots of differing size (pulse-width modulation) or spacing (frequency modulation) or both. This reproduction relies on a basic optical illusion: when the halftone dots are small, the human eye interprets the patterned areas as if they were smooth tones. At a microscopic level, developed black-and-white photographic film also consists of only two colors, and not an infinite range of continuous tones. For details, see film grain. Just as color phot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CMYK Color Model
The CMYK color model (also known as process color, or four color) is a subtractive color model, based on the CMY color model, used in color printing, and is also used to describe the printing process itself. The abbreviation ''CMYK'' refers to the four ink plates used: cyan, magenta, yellow, and key (black). The CMYK model works by partially or entirely masking colors on a lighter, usually white, background. The ink reduces the light that would otherwise be reflected. Such a model is called ''subtractive'' because inks "subtract" the colors red, green and blue from white light. White light minus red leaves cyan, white light minus green leaves magenta, and white light minus blue leaves yellow. In additive color models, such as RGB, white is the "additive" combination of all primary colored lights, black is the absence of light. In the CMYK model, it is the opposite: white is the natural color of the paper or other background, black results from a full combination of c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continuous Tone
A continuous tone image (contone for short, or CT even shorter) is one where each color at any point in the image is reproduced as a single tone, and not as discrete halftones, such as one single color for monochromatic prints, or a combination of halftones for color prints. The most common continuous tone images are film photographs (digital latitude is not continuous!) Also see film latitude. Every single dot of which can take a continuous range of colors depending on the quantity of captured radiance. On the other hand, at a microscopic level, developed black-and-white photographic film consists of only two colors, and not an infinite range of continuous tones. For details, see film grain. An example of a continuous-tone device is a CRT computer screen. Here, any pixel can represent any color, because the color components of the pixel are analog and can vary in infinite steps, and hence do not need halftones to make the colors. Of course, because the computer is a digital de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frederic Eugene Ives
Frederic Eugene Ives (February 17, 1856 – May 27, 1937) was a U.S. inventor who was born in Litchfield, Connecticut. In 1874–78 he had charge of the photographic laboratory at Cornell University. He moved to Philadelphia, Pennsylvania, where in 1885 he was one of the founding members of the Photographic Society of Philadelphia. He was awarded the Franklin Institute's Elliott Cresson Medal in 1893, the Edward Longstreth Medal in 1903, and the John Scott Medal in 1887, 1890, 1904 and 1906. His son Herbert E. Ives was a pioneer of television and telephotography, including color facsimile. Color photography Ives was a pioneer in the field of color photography. He first demonstrated a system of natural color photography at the 1885 Novelties Exposition of the Franklin Institute in Philadelphia.Louis Walton Sipley, ''A Half Century of Color'', New York: The Macmillan Company, 1951. His fully developed Kromskop (long-vowel marks over both "o"s and pronounced "chrome-scope") color ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lines Per Inch
Lines per inch (LPI) is a measurement of printing resolution. A line consists of halftones that is built up by physical ink dots made by the printer device to create different tones. Specifically LPI is a measure of how close together the lines in a halftone grid are. The quality of printer device or screen determines how high the LPI will be. High LPI indicates greater detail and sharpness. Printed magazines and newspapers often use a halftone system. Typical newsprint paper is not very dense, and has relatively high dot gain or color bleeding, so newsprint is usually around 85 LPI. Higher-quality paper, such as that used in commercial magazines, has less dot gain, and can range up to 300 LPI with quality glossy (coated) paper. In order to effectively utilize the entire range of available LPI in a halftone system, an image selected for printing generally must have 1.5 to 2 times as many samples per inch (SPI). For instance, if the target output device is capable of printing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Woodburytype
A Woodburytype is both a printing process and the print that it produces. In technical terms, the process is a ''photomechanical'' rather than a ''photographic'' one, because sensitivity to light plays no role in the actual printing. The process produces very high quality continuous tone images in monochrome, with surfaces that show a slight relief effect. Essentially, a Woodburytype is a mold produced copy of an original photographic negative with a tonal range similar to a Carbon print. The process was introduced by the English photographer Walter B. Woodbury and was in use during the final third of the 19th century, most commonly for illustrating fine books with photographic portraits. It was ultimately displaced by halftone processes that produced prints of lower quality but were much cheaper. Process A dichromate-sensitized sheet of gelatin is exposed to UV-rich light through a photographic negative, causing each area of the gelatin to harden to a depth proportional to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Arthur, Duke Of Connaught And Strathearn
Prince Arthur, Duke of Connaught and Strathearn (Arthur William Patrick Albert; 1 May 185016 January 1942), was the seventh child and third son of Queen Victoria of the United Kingdom and Prince Albert of Saxe-Coburg and Gotha. He served as Governor General of Canada, the tenth since Canadian Confederation and the only British prince to do so to date. Arthur was educated by private tutors before entering the Royal Military Academy at Woolwich at 16 years old. Upon graduation, he was commissioned as a lieutenant in the British Army, where he served for some 40 years, seeing service in various parts of the British Empire. During this time he was also created a royal duke, becoming Duke of Connaught and Strathearn as well as Earl of Sussex. In 1900 he was appointed as Commander in Chief of the British Army in Ireland, which he regretted; his preference being to join the campaign against the Boers in South Africa. In 1911, he was appointed as Governor General of Canada, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philadelphia
Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and the urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions, with 6.245 million residents . The city's population at the 2020 census was 1,603,797, and over 56 million people live within of Philadelphia. Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's inde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithography
Lithography () is a planographic method of printing originally based on the immiscibility of oil and water. The printing is from a stone ( lithographic limestone) or a metal plate with a smooth surface. It was invented in 1796 by the German author and actor Alois Senefelder and was initially used mostly for musical scores and maps.Meggs, Philip B. A History of Graphic Design. (1998) John Wiley & Sons, Inc. p 146 Carter, Rob, Ben Day, Philip Meggs. Typographic Design: Form and Communication, Third Edition. (2002) John Wiley & Sons, Inc. p 11 Lithography can be used to print text or images onto paper or other suitable material. A lithograph is something printed by lithography, but this term is only used for fine art prints and some other, mostly older, types of printed matter, not for those made by modern commercial lithography. Originally, the image to be printed was drawn with a greasy substance, such as oil, fat, or wax onto the surface of a smooth and flat limestone pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Relief Printing
Relief printing is a family of printing methods where a printing block, plate or matrix, which has had ink applied to its non-recessed surface, is brought into contact with paper. The non-recessed surface will leave ink on the paper, whereas the recessed areas will not. A printing press may not be needed, as the back of the paper can be rubbed or pressed by hand with a simple tool such as a brayer or roller. In contrast, in intaglio printing, the ''recessed'' areas are printed. Relief printing is one of the traditional families of printmaking techniques, along with the intaglio and planographic families, though modern developments have created others. In the relief family of printing, the matrix was historically made subtractively, by removing material from the surface of areas not intended to be printed. The remaining surface would then receive ink. The relief family of techniques includes woodcut, metalcut, wood engraving, relief etching, linocut, rubber stamp, foam pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Leggo
William Augustus Leggo (25 January 1830 – 21 July 1915) was a Canadian inventor, engraver and businessperson. He is noted for co-inventing the half-tone engraver with George-Édouard Desbarats. He had several patents to his name, including leggotyping and granulated photography. Early life Leggo was born in Quebec City on January 25, 1830, to William Augustus Leggo, a bookbinder and engraver, and Margaret Grant. After graduating from Quebec High School, he apprenticed as an engraver, first to his father and then to Cyrus A. Swett in Boston. Career Leggo worked with his brothers Thomas, Edward, and Henry in the family engraving business before partnering with George-Paschal Desbarats and Stewart Derbishire as Wm. A Leggo and Company on January 21, 1863. George-Paschal's son, George-Édouard Desbarats, joined the partnership when Derbishire died in March 1863, and became sole partner when his father died in November 1964. The two patented "Leggotyping", a type of phot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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