A technique used to fill the gap between two pixels with a further pixel in order to smooth out the value of the two or add further detail.
the attempt by a computer program to approximate a color from a mixture of other colors when the required color is not available.
Simulation of a color by grouping pixels of other colors. The human eye sees the grouped pixels as a mixed color. Dithering is useful when not enough colors are available on the monitor to exactly match a color in an illustration.
The action of smoothing an image for example to smooth the transition between two areas of different colors by adding a grainy effect.
Operation which allows to reduce the colour depth of an image reducing the amount of memory used as well as the definition.
A way of arranging dots on a page to simulate a shade or tone.
The positioning of random dots or patterns in order to merge palette colours to create colours that don't already exist in the palette. the purpose of dithering (also called error diffusion) is to blend disparate colours so that they appear to simulate continuous colour. Dithering increases the size of an image file and typically should be avoided when publishing on the Web.
A technique used to create the illusion of varying shades of gray on a monochrome display or printer, or additional colors on a color display or printer. Dithering treats areas of an image as groups of dots that are colored in different patterns. Similar to halftones in photography.
Also known as half toning, this is a process of varying size and pattern of dots of different color inks together to produce other colors. If the half toning algorithms are good, gradations will be smooth and you won't see any visible dots. Better-quality photo printers generally produce little, if any, visible dither pattern in the light-colored areas where they are most noticeable. See also Half toning.
Substituting combinations of colors you do have for colors that you don't. For example, if your computer is only capable of displaying 256 colors and you load an image that uses 65,000 colors, your computer will create substitutes fo the colors that you don't have by combining the colors that you do. The color quality of a dithered image is inferior to a non-dithered image.
when displaying a picture on a computer screen in, say, a 256 colour mode, it is possible to give the impression of intermediate colours by mixing dots of the different colours in different ratios - this is done using a random displacement of these dots to avoid a patterned effect. This technique is called dithering
When working with a computer display system that supports 8-bit color (or less), the video card can display only 256 different colors at one time. Dithering is a technique to simulate the display of colors that are not in the current color palette of a particular image. It accomplishes this by arranging adjacent pixels of different colors into a pattern which simulates colors that are not available to the computer.
A method of varying the pattern of pixels in an image to simulate intermediate colors and create smoother edges. See pixel, GIF.
A method of simulating unavailable colors by using patterns of available colors to create the appearance of continuous tone.
A technique for mixing two or more colours together in a dot pattern to create the illusion of additional colours.
A technique for increasing the perceived range of colors in an image at the cost of spatial resolution. Adjacent pixels are assigned differing color values; when viewed from a distance, these colors seem to blend into a single intermediate color. The technique is similar to the half-toning used in black-and-white publications to achieve shades of gray.
A method of simulating a continuous tone using a pattern of dots. Dithering can be used to reproduce gray shades using only black ink, or the full spectrum of color using only the process colors.
Intermixing dots and pixels of one color with those of another color until the blend gives the appearance of a third color.
A method combining pixels of different colors to create a different color. Program use three different methods to blend, nearest color, error diffusion and ordered diffusion.
A method of creating an intermediate color by placing two similar colors side-by-side.
In order to display a full-color graphic image on a 256-color monitor, computers must simulate the colors it cannot display. They do this by dithering which is combining pixels from a 256-color palette into patterns that approximate other colors. At a distance, the human eye merges the pixels into a single color. Up close, the graphic image will appear pixilated and speckled.
A method of fooling the human eye into thinking the resolution is double that of the actual value. It does this by focusing on one half of the pixel on one chopper scan, then the other half, on the next scan.
The XIL library includes a table-lookup function that enables you to convert a single-band image of any data type to a single-band or multiband image of any data type. Dithering can be thought of as an inverse lookup operation; that is, dithering enables you to convert a single-band or multiband image of any data type to a single-band image of any data type. The most common dithering operations convert 3-band, 8-bit images to 1-band, 8-bit images and 1-band, 8-bit images to 1-band, 1-bit images.
If the user's browser or system only supports 256 colors, the image is adjusted automatically by a process called dithering. The image displays but its quality is frequently diminished when this happens.
Dithering is the process of approximating a color that cannot be displayed with uniformly dispersed dots of other colors. Unless the resolution is high, this leads to a noticable degradation of the image. Using the web-safe color palette for your GIF images helps to avoid dithering on your web pages.
When a color that is not browser safe is displayed, two browser safe colors are mixed (or alternated) to create the desired color. This is called dithering.
Making digital images appear smoother by adding color or random noise during the digitization process.
A way of simulating gray tones or colors by grouping dots so they can be merged into a intermediate colors or tones.
the process of representing intermediate colors by patterns of tiny colored dots that simulate the desired color
A technique for creating an image with apparent levels of gray by grouping black and white dots into cells. According to the number of black and white dots and their arrangement in the cell, the eye perceives the cell as a single gray, not as a group of black and white dots. Commonly used by laser printers to simulate grey images. The NDLP use of diffuse dithering represents a special case in which the scanner's dot pattern is randomized.
Dithering is a useful feature when performing color reductions. This function diffuses adjacent pixels to represent colors, which are not actually in the image, resulting in a closer representation of the original color balance. Less Dithering level cause smaller image file size. The recommendation is to reduce Dithering level to the value where the image quality is acceptable.
The unclearness of an image due to a limited palatte.
The approximation of a color by mixing pixels of similar colors that are available in the image or system palette. The result of dithering is a random dot-pattern or noise in the image.
If you have a picture that is created in millions of colors (see bit depth), with smooth gradients and blends that look like a photo on screen, but you are looking at it on a monitor that only shows 256 colors, the computer will often Dither the image...that means taking the available colors and mixing them to approximate the colors needed - like taking light brown and pale yellow and pale pink dots and scattering them to make a flesh tone...from a distance it looks like it, but up close you can see the different colored dots. This makes your photo or image look grainy, dotty, or pixelated. On screen dithering is different than changing the actual image. When you reduce an image from millions of colors to 256 colors for example, and save it, the image is changed. When your image is still millions of colors, but your monitor just cannot show them all, this does not change the picture, only what you see. The picture still has all its glorious colors and blends, and will print out showing them.
An electronic technique of filling a gap between two pixels of different values. The new pixel will have an average value of each pixel on each side.
The method by which a computer monitor/video card attempts to display a colour it is not capable of actually displaying. Depending on the quality of a user's system, their monitor screen may not be capable of displaying the millions of colours that newer or better quality machines are capable of. The monitor will attempt to approximate the requested colour, but often the loss of quality is severe. It is particularly notable when colours fade or gradually diminish.
Displaying an image at a lower resolution than that at which the image was created. A photograph with millions of colors is dithered to display on a 256-color system. See Part IV.
Using a range of available colours to simulate one that is not available.
A method of displaying colours that are not available on a printer/monitor etc. The illusions of created by mixing available colours.
The process of mixing existing colors to create the illusion of another color that is not available in the given palette. There are two types of dithering: pattern and diffusion. Pattern dithering arranges pixels in a rigid pattern. Diffusion dithering applies a random pattern of pixels that adds a subtle grainy texture to the image.
Process of blending existing palette colors to approximate additional colors. To display a high-resolution color image on a system that has fewer colors than the image, Windows dithers the existing palette colors.
A method of simulating many colours or shades of grey with only a few.
A process which gives the illusion of varying shades of gray or shades of color.
A process whereby pixels of two colors are combined to create a texture or a blended color.
the printing process of simulating additional colours or shades by mixing available colours and varying dot sizes and spacing.
The positioning of different coloured pixels within an image that uses a 256-colour palette to simulate a colour that does not exist in the palette. A dithered image often looks 'noisy', or composed of scattered pixels.
If you set your computer to display only a small number of colours (or it can't display more than 256 anyway, because it's old) you'll notice little speckles when the monitor tries to display a colour part-way between the ones it can show. To avoid that dithered effect, which looks unpleasant and can make text hard to read, many websites used to restrict their colour palette to the 216 Domain A part of the internet, reserved for one organization. For example, Australian business web domains usually take the form of http://www.name.com.au where name is the business's name, com means commercial, and au means Australia. Many countries omit the com part and go straight from the organization's name to the country code. The part before the name is normally www (short for World Wide Web) but can be a name given to a web server or a division of the business.
If a color is not available, it can be made from the available colors by placing a pattern of colors next to each other to visually mix. For instance the illusion of "orange" can be made by placing red and yellow pixels next to each other.
Technique of using dither matrices to generate an expanded colour range for continuous tone imagery.
A halftoning method in which dots are arranged in an orderly pattern. Dithering works best when printing images with solid colors, such as charts and graphs.
In computer graphics, dithering is a method of creating additional colors and shades from an existing palette by interspersing pixels of different color in computer graphics to create additional colors and shades from an existing palette by interspersing pixels of different colors
Not getting on with it. Also a technique of simulating colours from adjacent pixeis to compensate for a limited colour range.
A graphics display or printing process that uses a combination of dots or textures to simulate an original image or an output device. The purpose is to create the impression of a continuous-tone gray-scale or color image.
This is used to reduce the colour banding that results with low colour depths, like 8-bit and 16-bit. Instead of having direct gradients with colours gradually changing in colour, each colour pixel is randomly diffused creating an overall gradient.
Making a limited number of colors look like more by placing related colors next to each other in a pattern.
A way of simulating grey tones or colours by grouping dots so they can be merged into a intermediate colours or tones.
The creation of additional colors and shades from an existing palette by interspersing pixels of different colors.
Alternating the values of adjacent dots or pixels to create the effect of intermediate values or colors.
The technique of manipulating patterns of dots produced by a printer to generate more colours or shades of grey than it should be capable of. For example if a black-and-white printer can print a small box as a pattern of black and white dots, the overall appearance of the box will be grey, its precise shade depending on the reladve proportions of the black and white dots. Similarly a simple colour ink jet printer can produce various shades of orange from patterns of red and yellow dots. This is a very effective technique, but the penalty is loss of resolution in the final image.
The method of using neighborhoods of actual display pixels to represent one image intensity or color. This method allows low intensity resolution display devices to simulate higher resolution images. For example, a binary laser printer can use block patterns to display gray-scale images.
A printing process that involves simulating additional colours or shades by mixing available colours and varying dot sizes and spacing.
The process of mixing dots (or pixels) of different colors together in the same region in order to give the appearance of other colors; often performed after an image has been quantized to a reduced number of colors, in order to spread the errors around more evenly. The procedure tends to reduce the contrast of sharp features and may introduce noticeable patterns in the image (as in the case of an ordered dither); it also reduces the compressibility of the image considerably, especially in the case of an error-diffusion dither.
Creating the illussion of new colours or shades by mixing dots of existing colours in special patterns.
A method of simulating gradations or grays or colors by spacing the same colored dots or pixels at different intervals.
The use of several different colors to simulate another color. Shows up as a dotted pattern. Dithering generally occurs on an 8-bit monitor with non-web safe colors
Process of specifying colour to adjacent pixels in order to simulate a third colour in a bitmapped image.
The method of mixing up neighboring pixels or consecutive frames of pixel information in a random fashion to create the effect of many intermediate levels of color.
The pattern of pixels or dots interspersed to create the illusion of solid color.
When a colour that is not browser safe is displayed, two browser safe colours are mixed (or alternated) to create the desired colour. This is called dithering.
Spatial dithering, the method of creating digital halftones.
Changing images to the Paletted color mode lets you use dithering to enhance color information. Dithering places pixels with specific colors or values relative to other pixels of a specific color. The relationship of one colored pixel to another creates the appearance of additional colors that do not exist in the color palette. You can use two types of dithering: ordered dithering and error diffusion. Ordered dithering approximates color blends using fixed dot patterns; as a result, solid colors are emphasized and edges appear harder. Error diffusion scatters pixels irregularly, making edges and colors softer. Jarvis, Stucki, and Floyd-Steinberg are conversion options that provide error diffusion.
replacing one uniform color with repeating patterns of other colors that approximate the initial color, or blending two colors to create a third color. Dithering can reduce compressibility and usability.
The process of intentionally mixing colours of adjacent pixels. Dithering is usually needed for 8-bit colour, and sometimes for 16-bit. It allows a limited colour set to approximate a broader range, by mixing groups of varying-colour pixels in a semi-random pattern. Without dithering, colour gradients like sky or sunset tend to show "banding" artefacts.
An image-processing technique that makes a digitized or rendered image appear smoother and more natural by simulating additional colours.
Dithering is the process by which a large number of colors are forced into a smaller color palette. This is typically used when a CRT screen may not be able to render manyh different colors. The closest color hues to the intended color hues are rendered. The loss of colors from the large intended palette results in a fuzzy image with fewer color hues.
The technique of making adjacent pixels different colors to give the illusion of an intermediate color. Dithering can produce the effect of shades of gray on a black-and-white display, or simulate a greater number of colors on a color display than the display is capable of producing.
The process of simulating shades of gray by altering the size and arrangement of black speckles on an image.
A method to display a range of colors with a limited palette. Each pixel on the source image is represented by multiple pixels (usually a 2x2 square) on the destination image. From a distance, the eye blends the multiple pixels into one color that has more shades than the original palette. The technique results in a better visual appearance than the removal of low precision bits. See a standard graphics reference for details. Dithering is a supported option by DXSurface and Microsoft DirectX Transform objects.
Dithering is the process by which colours in an image are approximated by pixels of similar colour placed close together. Dithering is often used in indexed colour images to make up for the limited gamut of colours.
A color bitmap with a limited color palette uses a gridwork of different color pixels that are perceived as additional colors. In Photoshop: when an image is changed from grayscale to bitmap mode, pattern dithering converts the gray levels to a geometric configuration of black and white dots. When an image is changed from grayscale to bitmap mode, diffusion dithering converts the image using an error-diffusion process, starting in the upper left corner in the image. If the pixel is above middle gray (128), the pixel is changed to white—if below, to black. Because the original pixel is rarely pure white or black, error is inevitably introduced. This error is transferred to surrounding pixels and diffused throughout the image, resulting in a grainy, film-like texture.
Approximating a signal value on a chroma-limited display device by producing a matrix of color values that fool human perception into believing that the signal value is being reproduced accurately. For example, dithering is used to display a true-color image on a display capable of rendering only 256 unique colors, such as IndigoVideo images on a Starter Graphics display.
A technique used in computer graphics to create the illusion of varying shades of gray or additional colors by distributing the screen pixels or imagesetter dots of an image. Dithering relies on the eye's tendency to blur spots of different colors by averaging their effects and merging them into a single perceived shade or color.
The process of converting grays to different densities of black dots, usually for the purposes of printing or storing color or grayscale images as black and white images.
A method for simulating many colours or shades of gray with only a few. A limited number of same-coloured pixels located close together is seen as a new colour.
A process used in some color printers and graphics software to adjust the number of dots of different colors within a matrix of eight pixels to produce many shades.
A technique of filling the gap between two pixels with another pixel having an average value of the two to minimise the differences or add detail to smooth the result
the alternating dots of two or more colors, typically to blend between colors or to create a new color not found in the color table. From a distance a dithered color will appear to be a single color. Older 8bit monitors also use dithering to display colors that are not present in the system palette. Use the web safe (or 216 color table) to avoid having this adversely affect your images.
A method of representing an image using fewer colors than the image actually has.
A method of simulating many colors or shades of gray by combining only a few; for instance, red and blue dots are dithered to make purple. Dithering allows a photo with millions of colors to be displayed on a 256-color monitor and printed on a 4-color printer.
Error diffusion, or dithering, is a way of avoiding aliasing due to a cut-down palette size. If a colour cannot be matched exactly then the nearest colour is used and the difference remembered. Then on the next pixel the difference is added to the desired colour and the result matched to the nearest colour available. In this way a mid-blue, for example, might be represented by a scattering of dark blue and light blue, if that mid-blue were not available in the current palette.
1. The process of averaging between pixels of different colors. In practice, the result is a smoother, blended transition between the edge of two areas rather than a distinctly jagged or 'stair-step' appearance. See also: anti-aliasing. 2. A printing method used by ink jet and other nonimpact printers where colors are produced by mixing colored dots in a more randomized visual pattern.
the technique of making adjacent pixels different colors to make them appear like a different color; utilized to add the appearance of greater color depth with a limited # of colors
Process that simulates color variations or shades of gray by varying the sized and shapes of pixel groupings, rather than an ordered array of halftone dots. This reduces the contrast between dots of different colors/shades and creates a more-flowing, natural look.
A method for simulating many colors or shades of gray with only a few. A limited number of same-colored pixels located close together is seen as a new color.
A technique of filling the gap between two pixels with another pixel having an average value of the two to smooth out the resulting image.
The ability for a computer to approximate an undefined color by combining the "RGB values", or percentage of red green and blue combined to create a color onscreen.
A technique used on computer screens and low-resolution output devices to produce a higher quality image in which the halftone cells are arranged in an overlapping pattern.
A half toning method where several dots of the primary colors are printed in various patterns to give the impression of a larger color spectrum.
A process that simulates shades of gray or color variations by differing sizes and shapes of pixel groups instead of an ordered array of halftone dots. This reduces the contrast between dots of different colors or shades and yields a more flowing, natural impression.
A process in which software or an output device simulates continuous tones with groups of dots.
A halftoning method in which dots are printed in a predetermined pattern to simulate a shade or tone. Dithering works best for images with solid colors, such as charts and graphs. See also halftoning.
Simulating unavailable colors in a displayed graphic by using a pattern of two or more available colors.
Simulating gray tones by altering the size, arrangement or shape of background dots.
Utilised when images are reduced from 24-bit to 8-bit colour. The dithering algorithm combines pixels of adjacent colours into a dot pattern, simulating unavailable colours. It reduces the posterisation effect that colour depth reduction can create. Photoshop offers two dithering options - the best is Diffusion Dithering.
When a monitor cannot display intermediate colors or tones it attempts to achieve the required color by intermixing the two closest colors in a scattering (dithering) of pixels. This occursmost often when you attempt to display a full color image on a monitor with a 256 or a 64000 color video display board. In an illustration dithering can make typography almost impossible to read.
display: Mixing colors you do have to provide the illusion of more colors than are available by sacrificing resolution. A process commonly used in printing to reduce the number of colors needed for a particular print job. Also used with black and white images to give the illusion of gray when seen from a distance.
Creating the illusion of new colours and shades by varying the pattern of dots. Newspaper photographs, for example, are dithered. If you look closely, you can see that different shades of grey are produced by varying the patterns of black and white dots. There are no grey dots at all. The more dither patterns that a device or program supports, the more shades of grey it can represent. In printing, dithering is usually called half toning, and shades of grey are called halftones. Manipulating the arrangement or shape of dots to simulated grey tones. (e.g. Newspaper pictures). The process of converting greys to different densities of black dots, usually for the purposes of printing or storing colour or greyscale images as black and white images.