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	Halftone - Wikipedia, the free encyclopedia
		Halftoning is a method of printing shades using a single color ink.
		A pattern of dots that is used to represent a particular shade is known as a halftone screen.
		Digital halftoning utilizes a raster image or bitmap within which each monochrome picture element or pixel may be on or off, ink or no ink.
	en.wikipedia.org /wiki/Halftone (643 words)

	Ted's Photographics - The Science of Photography - Halftone Reproduction
		Traditionally a halftone is created by placing a glass screen, with a finely ruled grid of lines, close to the emulsion surface in a process camera.
		The angle of the halftone screen is usually set at 45 degrees to the horizontal as this appears to be the easiest on the eye.
		When two screens are superimposed and are not quite aligned, or when the halftone screening process is applied to images with patterns or previously screened photographs there is the possibility of creating moiré patterns due to the interference of one screen on another.
	www.ted.photographer.org.uk /photoscience_halftones.htm (893 words)

	Understanding Bitmaps
		Halftone screening is a conventional method of producing shading and was used way before the computer era.
		While halftone screening varies the size of halftone dots to simulate shading, stochastic screening varies the frequency of halftone dots to create variation from light tones to dark tones.
		In practice, the size of a halftone cell is specified in terms of screen frequency that is the number of halftone cells (or they are usually called lines) in one inch.
	www.oberonplace.com /dtp/halftone (1494 words)

	Halftone -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-07)
		Halftoning is a method of (Reproduction by applying ink to paper as for publication) printing shades using a single (A visual attribute of things that results from the light they emit or transmit or reflect) color (A liquid used for printing or writing or drawing) ink.
		The number of dots measured horizontally in one inch is the typical way of measuring a screen, known as the screen ruling and represented with a hash mark.
		The general idea is the same, by varying the density of the four primary printing colours, cyan, magenta, yellow and fl, any particular shade can be reproduced.
	www.absoluteastronomy.com /encyclopedia/h/ha/halftone.htm (587 words)

	Halftone Scanning vs. Halftone Screening (Site not responding. Last check: 2007-11-07)
		Another advantage is that once the scan is completed, you don't have a large grey scale file, but rather a simple 1-bit fl and white file that approximates the grey range of your selected output device and takes up only a fraction of the space that a grey scale would.
		For instance, If you perform a halftone scan with the Microtek plug-in set for a "5x5 60 dot #1" pattern (the recommended pattern for the Apple Laserwriter IIf photograde) it will look great when printed to the Laserwriter, but appear like a strange rippled newspaper photo when printed at 1200dpi on a Linotronic.
		Halftone screening a scan is not entirely without merit, however.
	www.brown.edu /Students/CONMAG/ScreenvsScan.html (233 words)

	halftone - index page - Free MP3 downloads, CDs, Bio Info, Tour Dates, Lyrics and More!" (Site not responding. Last check: 2007-11-07)
		Halftone is the collective effort of four friends creating sound and music through free-rock based improvisation.
		Rather, all the different styles and influences that Halftone touch on in their performances are the natural outgrowth of their love of music, their natural abilities and tastes, and their own well developed individual styles.
		Prior to this, Halftone played for more than three years in relative seclusion, developing their collective voice through nonstop late-night improvisation sessions that sometimes would last for hours on end.
	www.iuma.com /IUMA/Bands/halftone/index-0.html (364 words)

	Applications of a spatial extension to CIELAB
		The grayscale ramp target was halftoned at 27 different spatial resolutions (from 72 dpi to 1200 dpi) using a multi-level error diffusion algorithm.
		Halftone errors do not decrease linearly with the increase of DPI or number of gray levels.
		The color test pattern were halftoned at 2, 3, 4, and 5 levels on (a) the C, M, or Y inks separately (use 2 levels on the other two inks), and (b) all three of the inks.
	white.stanford.edu /~brian/scielab/spie97/spie97.html (1677 words)

	Halftone Screens and Dots. Learn by free tutorials
		The term Halftone Screen refers to the pattern of dots of varying sizes applied to an image of varying tones, or same sized dots applied to a tint of colour, when output to - film for the printing processes - or laser printed artwork etc..
		The 45 degree angle is the least noticeable and offensive to the human eye whereas an angle of 90 degrees is very obvious and draws attention to the dots rather than the image detail (the picture).
		The pattern created by 2 or 3 halftone screens layed at 30 degrees to each other is called a rose pattern, a seemingly simple and unobtrusive pattern that normally does not offend the eye.
	www.dtp-aus.com /hlftone.htm (824 words)

	Halftone screen generator and halftone screen and method for generating same (US5774229)
		A halftone screen generator, halftone screen and a method for making the halftone screen are described.
		The halftone screen has a screen angle and rulings that define the theoretical centers of gravity of the halftone dots.
		The actual centers of gravity of the halftone dots are displaced from the theoretical centers of gravity by the length and angle of random phase vectors.
	www.delphion.com /details?pn10=US05774229 (476 words)

	Halftone Screening Basics (Site not responding. Last check: 2007-11-07)
		Each halftone cell is assigned a different sized dot to represent the image data for the cell.
		The size of halftone cells is determined by the interaction of the screen frequency with the image recorder resolution.
		The halftone screen represents the yellow color separation, usually printed at a 90° angle to the resolution grid and so is easy to align with that grid.
	www.prepress.pps.com /TechReports/screeningtr.html (3597 words)

	KPG - White Paper - The Value of Digital Halftone Proofing (Site not responding. Last check: 2007-11-07)
		Halftone proofing systems can detect a moiré pattern that is caused by the interaction of the printing screen frequency and an image subject.
		By looking at the halftone dot structure on the proof, the press operator has more information to analyze and compare, The operator can assess print quality differences between the proof and the press, and what might be done to solve a particular color problem.
		Although halftoning is an important differentiating factor, the Kodak Approval XP System has been designed to overcome many of the deficiencies that plague processes such as Ink Jet.
	www.anitec.com /white_papers/archive/digihalf.html (2612 words)

	Analog Halftone Processes (Site not responding. Last check: 2007-11-07)
		Typical for a halftone screen is a regular array of dots lined up in perpendicular directions.
		The regular halftone screen has a very typical appearance that is hard to mistake for other dot patterns.
		A monochrome halftone screen, typically fl and white, is utilized by many desktop laser printers.
	aic.stanford.edu /sg/emg/juergens/ID43.htm (360 words)

	Halftone Primer - Support Knowledgebase (Site not responding. Last check: 2007-11-07)
		To create halftones, the dots must be grouped into clusters or halftone "cells." The number of shades of gray that we can print is limited by the dpi and the maximum size cell we're willing to accept.
		Because halftone cells are used in rows or lines, the number of cells per inch is often expressed as "line frequency," "lines per inch," or lpi.
		Different halftone line angles are used for each color to minimize the effects of the many colored dots forming unwanted wave patterns called "moire." Products such as PageMaker can change the line frequency and the angle of the halftone cell lines for special effects.
	www.adobe.com /support/techdocs/313310.html (600 words)

	Frequency modulated halftone image and method for making same (EP0642258A2)
		A frequency-modulation halftone image and method that enable the use of relatively large frequency-modulation halftone dots, which have desirable reprographic characteristics, in combination with high resolution rendering of text, graphics, and boundary information in general.
		In one embodiment each elemental threshold value (932) is replicated twice in each dimension, which causes the halftone dots to have a size that is twice as large as the recorder pitch.
		A frequency-modulation halftone image (906) - generated by a frequency modulation halftone screening process from a contone image (902) - having a plurality of halftone dots at least some of which have a size greater than the size of one pixel (904) of said contone image.
	www.delphion.com /details?pn10=EP00642258 (294 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		The halftone process is a procedure in which acontinuous tone original is converted to a pattern of ____________ that allow ink to be placed on the offset plate.
		If you examine a halftone with a magnifying glass you will see tiny dots that vary in ____________.The varying tones of continuous tone copy are converted to halftone ______ with a halftone ________.
		A halftone screen is a sheet of film with a ______________________ (diffused) pattern of dots.
	www.fscwv.edu /users/llauffer/210/Hird_14.doc (1411 words)

	GHI
		Halftone: In order to simulate the reproduction of continuous tone images with ink on paper it is necessary to convert the continuous tone image into a halftone image.
		So for a halftone image we need to be able to print 256 different sizes of dots.
		To print 256 different sizes of halftone dots an image setter divides the area up into halftone cells that are 16 imagesetter dots wide by 16 imagesetter dots high.
	www.pixelphoto.com /Main/ghi.html (630 words)

	Encyclopedia: Halftone (Site not responding. Last check: 2007-11-07)
		An ink is a liquid containing various pigments and/or dyes used for colouring a surface to render an image or text.
		Cyan, magenta, yellow, and key (fl) CMYK (or sometimes YMCK) is a subtractive color model used in color printing.
		A moirÃ© pattern is an interference pattern created when two grids are overlaid at an angle, or when they have slightly different mesh sizes.
	www.nationmaster.com /encyclopedia/Halftone (824 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		Halftoning is an image technique which breaks down an image into a series of dots to produce the appearance of continuous tone.
		Traditionally, a halftone was created by placing a halftone screen between a piece of film and and an image, and then exposing the film.
		Creating halftones is a huge subject area, which is a small subset of printing technology.
	online.redwoods.cc.ca.us /irc/tutorials/glossary/entries/halftone.htm (298 words)

	What is halftone? - A Word Definition From the Webopedia Computer Dictionary
		Halftones are created through a process called dithering, in which the density and pattern of fl and white dots are varied to simulate different shades of gray.
		In conventional printing, halftones are created by photographing an image through a screen.
		If you are printing on a low resolution device, therefore, you may get better results with a lower screen frequency.
	www.webopedia.com /TERM/H/halftone.html (193 words)

	Tip - Creating a Halftone Screen Effect
		Halftone Screens are used in printing to reproduce the images you create in programs such as FreeHand or PhotoShop.
		The first step is to create the colored halftone "dots" that you'll be using in the Tiled filled objects.
		Once applied to various stacked shapes, they create a crazy halftone image that could be used for a retro type of design.
	www.freehandsource.com /_frames/_tips/_archive/tip_week049.html (579 words)

	UV9000 Ultra Dot Halftone UV Screen Printing Ink (Site not responding. Last check: 2007-11-07)
		Ultra Dot Series Halftone is an ultra violet curable acrylic screen printing ink specifically formulated for multi purpose use in point of purchase (P-O-P) printing.
		Ultra Dot Halftone Series has excellent adhesion properties, while maintaining a high degree of flexibility for superior die cutting.
		Ultra Dot Series Halftone withstood 1000 hours of exposure with 4-hour cycle times of UV light and condensation at elevated temperatures with minimal color change and marginal shrinkage.
	www.lawsonsp.com /inksgraphic/UV9000UltraDot.php (543 words)

	Specifying halftone screens for Bitmap-mode images
		If you print the image on a halftone printer, it will print with the halftone screen you choose here plus that of the printer.
		The screen frequency specifies the ruling of the halftone screen in lines per inch (lpi).
		Continuous-tone and fl-and-white halftone screens commonly use a 45° angle.
	pdesigner.net /photoshopcs/1_7_5_3.html (271 words)

	Production First Software Encyclopedia of Typography and Electronic Communication : H
		In color devices, the situation is less clear, because a color hue is produced by using more than one primary or process color simultaneously, each color being limited to the width or height of a dot or pixel; and the spatial relationship or separation between dots or pixels is also an influencing factor.
		halftone or halftoned or halftoning Graying or coloring of a glyph or image by using a uniform field of small fl or colored circular dots or other marks.
		halftone screen A field or array of marks which are modulated by an image to represent shades of gray.
	ourworld.compuserve.com /homepages/profirst/h.htm (3627 words)

	The Scanning FAQ - Halftone (Site not responding. Last check: 2007-11-07)
		Halftone scanning is essentially treated like a greyscale scan by most software and the conventional wisdom says to scan the image at a resolution lower than the original in order to reduce the threat of moires.
		Halftone scanning is scanning an original from an already screened source such as a magazine, coffee table book, newspaper, etc. However, many scanners now come with plug-ins, or custom software that has an option labeled Halftone.
		Check your manual about this, but most of these options are for creating a custom halftone screen of the image being scanned not for scanning a pre-screened halftone.
	www.acay.com.au /~trine2/Scanning_FAQs/TSF-Halftone.html (534 words)

	halftone Computer Encyclopedia Enterprise Resource Directory Complete Guide to Internet (Site not responding. Last check: 2007-11-07)
		The reproducion of {greyscale} {images} using dots of a single shade but varying size to simulate the different shades of grey.
		{Laser printers} that cannot print different sized dots, halftones are produced by varying the numbers of dots in a given area.
		This process is also used to produce a fl and white version of a colour original using shades of grey in place of colours.
	jaysir.com /computer-encyclopedia/h/halftone-computer-terms.htm (86 words)

	American Printer: Big is beautiful - Fullsite digital halftone Proofing - CreoScitex machinery - Brief Article (Site not responding. Last check: 2007-11-07)
		Having a large-format (30 x 40-inch) digital halftone proofing device allows customers to view a contract halftone proof in a layout that is imposed to match the printed press sheet.
		Using a large-format digital halftone proofer, trade service providers can deliver an imposed proof, along with the digital data, directly to the printer, thereby further ensuring data integrity and accuracy.
		The trade service provider could supply imposed data and large-format digital halftone contract proofs to its new partners, thereby winning new business by being able to provide unique services that the previous supplier could not.
	www.findarticles.com /p/articles/mi_m3254/is_2_228/ai_80749002 (823 words)

	Richard Rosenman - Halftone: plugin for Apple Photoshop
		Reducer: This slider reduces the size of the halftone dots while keeping the distances locked.
		A Trans: This slider controls (in percent) the transparency of the halftone dot over the underlying image.
		Outline: This slider controls (in percent) the intensity of the outline of the halftone dot using the outline color.
	www.pluginsworld.com /plugin.php?editor=apple&software=photoshop&plugin=254&plug=halftone (184 words)

	Halftone Dither (Site not responding. Last check: 2007-11-07)
		Of course, you can just use a brush, but I am usually more happy with the results doing it this way, as this method actually fits the image.
		I will try to remember to make a brush of the halftone layer and post it at the end of the tutorial, just in case you'd rather do it that way.
		First, prepare the base you are planning to use.
	www.prismnet.com /~dawng/pstuts/halftone_dither/halftone_dither_p1.htm (322 words)

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