Opposition or dissimilitude of things or qualities; unlikeness, esp. as shown by juxtaposition or comparison.

The opposition of varied forms, colors, etc., which by such juxtaposition more vividly express each other's peculiarities.

The difference between the thick and the thin strokes of a character.

Diversity of adjacent parts in color, emotion, or tone. The use of diverse elements within a composition.

To look at differences, mostly opposites.

Tell how two or more topics are different from associated things, qualities, or events, etc.

Relationship between the luminance of an object or detail and it's background.

Contraste Kontrast, m Contraste Contrasts happen when colors are paired in such a way that each intensifies the other. The strongest contrasts are the result of putting together complementary colors. Contrasts of tone and temperature also exist.

The difference in light intensity in an object or image; defined as (Imax - Imin)/(Imax + Imin), where Imax and Imin are the maximum and minimum intensities.

A measure of the relative intensity differences within an image. A low contrast image may be dark (a foggy night), or bright (a foggy day); a high contrast image has bright and dark areas. The difference between an image's lightest and darkest grey level value.

Looking at two or more statements, incidents, or conditions for the purpose of understanding the difference between them.

The relationship between the lightest and darkest areas in a scene and/or photograph. A small difference means low contrast; a great difference high contrast. High contrast scenes usually cause the most exposure problems; however, their difficulty can mean they hold the potential for more expression. Though contrast is often linked with scene brightness, there can be low contrast in a bright scene and high contrast in dim light. Contrast can also describe attributes of color, composition, and inherent qualities of film.

the range of values (light to dark) in a picture. (Drawing Lesson 19)

The difference in tone between the dark and light areas of an image. Higher contrast values indicate greater differences and fewer gradations between dark and light.

Difference between black and light in a picture.

Contrast is the difference between the brightest bright and the darkest dark in your digital photo. If your digital photos have too much contrast it will cause a loss of delicate shadings and shadows. Whereas too little contrast leaves your photos muddy.

Density difference between the highlights and the shadows, usually of adjacent areas of the image.

a strong difference between two elements in a comparison.

The difference in brightness between different light and dark tones within a scene.

The level of tonal difference between darks and lights.

The measure of difference in the film or detector density (darkness) from one area to another, resulting from various X-ray intensities interacting with the detector.(Course Material/Radiography/TechCalibrations/contrast.htm)

The different range of tones between highlights and shadows.

The range of light-to-dark values present in a film or video image.

the difference between elements or the opposition to various elements.

The range of difference between the darkest and lightest areas of an image

The extent to which adjacent areas of an image on a display screen differ in relative brightness.

Comparison in order to distinguish differences. In radiology, the visual differentiability of variations in photographic or film density produced on a radiograph by the structural composition of the object or objects radiographed.

the relationship between light and dark areas of an image. The more extreme the difference, the greater the contrast.

This is the difference in reflectance between the black and white (or bar and space) areas of a symbol.

contrast can be defined as the relative difference of the signal intensities in two adjacent regions. If the two intensities are Ia and Ib, a useful quantitative definition of contrast is (Ia-Ib)/(Ia+Ib). Relating image contrast to object contrast is more difficult in magnetic resonance imaging than in conventional radiography, as there are more object parameters affecting the image and their relative contributions are very dependent on the particular imaging technique used.

Contrast is the visible difference in brightness from the darkest color to the lightest.

The difference in light and dark tones on a negative, slide or photo. This applies mostly to black and white prints.

The contrast ratio indicates how much brighter an image is at the projection of 100% white and 100% black. A high contrast ratio leads to brilliant, luminous images.

The amount of separation of tones in a photograph. The quantitative difference between light and dark.

The difference of tonal gradation between light and dark values within an image. A high-contrast image is predominantly highlights and shadows with a few gray tones. A low contrast image has few highlights and shadows with predominantly even tones. Image contrast is sacrificed somewhat when tones are compressed to bring an original's density down to a range that can be reproduced on a printing press.

Ratio between black and white in the picture.

describe the ways in which two things are different

The difference between the lightest and the darkest areas of an image. The greater the difference, the higher the contrast.

The relationship between the light and dark areas of an image. Contrast is the range between the darkest and lightest shades in an image, while brightness is the balance of light and dark shades. Contrast determines the number of shades; brightness determines the intensity of the shades. An image with low contrast tends to look dull and flat.

Amount of difference in reflectance between the dark bars and the light spaces of a bar code; measured by print contrast signal (PCS).

The extent to which adjacent light and dark areas of a television picture differ in brightness.

The degree of density difference between tones in an image or the ratio between the maximum and minimum brightness values. A high contrast image will have deep or intense blacks and detailed or spectral whites which may or may not include a full range of middle value tones. A low contrast image is generally an image with all its tones placed in the short middle values and may only contain various shades of grey.

An option available from the Image Menu (sub) Adjust (sub) Brightness/Contrast. Contrast correction is useful for varying the difference between light and dark areas. Increasing the contrast makes the dark shades darker and the highlights lighter at the same time causing more contrast between the two.

The part of the luminance signal that provides depth perception

The range of brightness between the darkest and lightest elements of an image.

The ratio of the difference in light intensity between the brightest white and the darkest black.

Degree of difference between highlights and dark portions of a photograph or of prepared art that embodies a range of tones. Example, black to light gray.

The level of variation between light and dark areas in an image.

Demonstrate how things are different

The actual difference in density between the highlights and the shadows on a negative or positive. Contrast is not concerned with the magnitude of density, but only with the difference in densities.

The ability to compensate for light and dark shades of an original. Contrast control can be either automatic during scanning or manual may be selected.

examine the objects in question for the purpose of demonstrating differences.

See luminance contrast.

A principle of design that refers to differences in values, colors, textures, and other elements in an artwork to achieve interest and emphasis.

Difference between a picture's brightest and darkest areas. When high, image contains sharp blacks and whites; when low, image limited to variations in gray tones. control track: A portion of the videotape containing information to synchronize playback and linear videotape editing operations.

The difference between the brightness of an object compared to that of its immediate background.

The difference in luminance between two areas.

Deliberately single out and emphasise the differences and dissimilarities between two or more things. Stylewriter is a software program which offers help with writing skills such as summarising, editing, and proof-reading your work. It also offers a selection of writing styles to choose from - academic writing, journalism, formal prose, and so on. Mistakes and suggestions for improvement are highlighted and implemented with a click of the button.

The difference between the blackest black and the whitest white in a monitor display

The difference between two areas in an image; it enables the radiologist to see details.

The contrast is the degree of difference between the dark and the light areas of a scene or photograph. High contrast photographs are a result of high contrast lighting, where there are sharp differences in the dark and light, and less in between. High contrast lighting can be achieved with both direct and bounced light that is not softened or diffused, but often reflected from a bright silver surface.

Difference in the relative brightness of two objects

domain relation which connects conjuncts whose difference is stressed.

Differences between at least two (2) things. eg. "The teacher's character is contrasted with the sweet young girl who is her student."

an obvious difference between two things (e.g. light and dark).

the relative difference of signal intensities in two adjacent regions of an image. Image contrast is heavily dependent on the chosen imaging technique (i.e., TE, TR, TI), and is associated with such parameters as proton density and T1 or T2 relaxation times.

The tonal or colour difference between to tones or colours in an image. An image is said to be high-contrast when there is little or no mid tones and lots of white and black. An images contrast is represented or expressed by it gamma measurement.

Refers to differences in values, colors, textures, and other elements in an artwork used to achieve emphasis and interest (A Principle of Design).

The difference (ratio) between the darkest and brightest parts.

the degree of distinction between the darkest and lightest parts of an image.

Most IR cameras can manipulate the image to provide better 'contrast' between brighter or darker objects. Increasing the contrast to improve the difference between such targets can cause the image to become saturated if a brighter target then comes into view. Many camera systems use the terminology 'gain', instead of contrast. While these terms are not strictly synonymous, their effect on the image is similar.

Bring out the points of difference. Stress the differences of qualities, events, problems, texts, authors. Keyword(s): contrast

the opposition or dissimilarity of things that are compared; "in contrast to", "by contrast"

the act of distinguishing by comparing differences

the perceptual effect of the juxtaposition of very different colors

the range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness)

put in opposition to show or emphasize differences; "The middle school teacher contrasted her best student's work with that of her weakest student"

to show differences when compared; be different; "the students contrast considerably in their artistic abilities"

a difference among means

a way of specifying which images you want to include in that difference

To compare in respect to differences. The differences between things having a similar nature.EXAMPLE: " Not enough sense to golf in a lightning storm."

The ratio of the luminance of an object to that of its immediate background.cosine lawThe law that the illuminance on any surface varies as the cosine of the angle of incidence. (The angle of incidence is the angle between the normal to the surface and the direction of the incident light.)

The noticeable difference between blacks and whites in a picture. If the two extremes look like gray and off-white the contrast is not good. A gray scale can be used to check the monitor’s ability to reproduce good contrast.

Stands for the range of light and dark values in a picture. A high contrast picture is dominated by black and white and few values between. A low contrast picture has a lot of middle tones without many very dark or very light areas.

The difference in density, or luminosity, and the degree of tonal separation in a subject, negative or positive print. See: High Key Photograph, Low Contrast Light, and High Contrast Photograph.

Specific question(s) regarding the differences between two or more means. A method for comparing two or more means.

The difference or degree of difference between things having similar or comparable natures, such as light and dark areas, colors, or typefaces.

in photography is the difference between the brilliant (or light) and the dense (dark) areas of an image. A high contrast image is one with both very bright white/highlights and very deep shadows. A low contrast image (such as you might get on a foggy morning) would have no highlights and perhaps no areas entirely black.

The juxtaposition of two dissimilar colors or objects.

A large difference between two things, as in colors or shapes.

An image with light tones (highlights) and dark tones (shadows).

A term used to describe the degree of white to black)variation in an image. In a black and white image, there is a large difference in the value range (since there are no in-between grays in the image). An image made of only black and white (and no gray values) is therefore the highest in contrast, while an image with many grays and few white (highlights) and black (shadows) is a low contrast image.

The difference between the brightest and darkest parts of the picture.

opposition or unlikeness of different forms, lines, colors, or textures in a landscape.

The tonal gradation between the highlights, mid-tones and shadows in a reproduction of a continuous tone image.

ratio: A relationship indicative of the difference in light reflection (or brightness) of the brightest and the darkest spots of an image (i.e. a contrast ratio of 40:1 means that the brightest spot is forty times brighter than the darkest spot).

Artistic combinations of light against dark, large against small, or use of bright colors to bring the viewer’s eye to a certain point in a composition. It demonstrates a quality of design that permits one element to stand out clearly from others.

The difference in signal intensity of two tissues in an image. [ Chapter 8

Dynamic range of light and dark values in a picture.

Relationship between the darkest and lightest areas of an image

The difference between light and dark areas of a photographic image. The extent of the variation is known as the tonal range. A contrasty image is one where there is a great degree of light and dark areas and not so many mid tones.

The difference in reflectance or albedo between an object and its background.

Measures the rate brightness values change in the image. A high contrast image has a narrow range of relative brightness values. As you increase contrast in an image editing software, the dark colors become darker and the light colors become lighter. For some images, increasing contrast can help bring out details in the image.

the degree of difference in tone between the lightest and the darkest areas in television or display picture. Contrast is measured in terms of gamma a numerical indication of the degree of contrast. Pictures with high contrast have deep blacks and brilliant whites, and pictures with low contrast have an overall grey appearance

Specification of the brightness proportion of the primary colors of an image from a minimum (gray = no contrast) to a maximum (all 256 levels), even to the inversion of the color.

Extreme differences in colors, values, textures and other elements.

design principle that emphasizes differences between the art elements. For example, a painting may have bright colors that contrast with dull colors or angular shapes that contrast with rounded shapes. Sharp contrast draws attention and can direct a viewer to a focal point within a work of art.

value contrast; color intensity; texture, shape, and warm and cool color contrast. Contrast refers to differences in values, colors, textures, shapes, and other elements. Contrasts create visual excitement and add interest to the work. If all the art elementsÑvalue, for example Ñare the same, the result is monotonous and unexciting.

The difference between the luminance (brightness) of the detail in a visual task and the luminance of its immediate background (e.g., between the print and the paper).

A principle of design that emphasizes the difference between a plant or an object and its surroundings.

The difference in brightness between the subject (e.g. text) and the background against which it is viewed

Subjective differences in brightness between light and dark areas in an image.

Materials used in radiological studies to enhance the differences between different structures to enhance imaging and diagnosis.

differences within and between the elements of music

A measure of the luminance difference between two areas. Contrast can be formulated in different ways, e.g., contrast ratio, modulation contrast, etc.

A radiopaque substance used during an X-ray exam (or some MRI exams) to provide visual contrast in the pictures of different tissues and organs. Can be given orally or intravenously.

The degree of tonal values in an image ranging from black to white

The visibly noticeable difference in color and value between two coat colors on a cat.

The range between white and black in an image.

The tonal gradation between the highlights, mid-tonws, and shadows in an original or reproduction.

refers to the ratio of the brightest part of an image versus the darkest part of an image (for example, 100:1).

The degree of difference between the thick and thin strokes ina font (if any).

Discuss and , emphasising their differences

Stress dissimilarities, differences, or unlikeness of things, qualities, events, or problems.

The range of light to dark values in a picture.

The difference in brightness between the lightest and darkest areas of a photograph or other type of art.

The range of light and dark values in a picture or the ratio of maximum and minimum brightness.

the range of difference in the light to dark areas of an image.

The tonal graduation between the highlights, middle tones and shaddows in an original or reproduction.

Contrast is created by using opposites near or beside one another, such as a light object next to a dark object or a rough texture next to a smooth texture.

the range of shades in an image.

See "Image contrast", "Radiation contrast", "Object contrast" and "Visual contrast".

Qualitatively defined as the perceived difference in brightness (intensity or irradiance) between a specimen and its surrounding medium, optical contrast is also more quantitatively described as the ratio of the light intensity of a specimen to the light intensity of the background.

A common term used in reference to the video picture dynamic range, i.e., the difference between the darkest and the brightest parts of an image.

Opposites, such as light and dark, rough and smooth, soft and hard, in close proximity

the design principle that states that visual elements on a page should look distinctly different from one another. Variance in how design elements are different from each other: in color, by location, shape, size, etc.

A setting that maximizes or minimizes the difference between the bright and dark parts of an image.

The difference in brightness between the lightest and darkest parts of a picture. A high-contrast picture is dominated by black and white and few values between. A low contrast picture has a lot of middle tones without many very dark or very light areas.

The variation between the lightest and darkest parts of an image.

Point out the differences between two things (but probably point out their similarities as well).

The relationship between the luminance of an object and its background.

to look for differences between two or more things

The degree of difference between light and dark areas in an image. Extreme lights and darks give an image high contrast. An image with a wide tonal range has lower contrast.

In relation to microscopes, the ability to distinguish different densities of structures.

In cinematography, the difference between the brightest and darkest areas within the frame.

enhance or reduce the image contrast

In design, the use of dissimilar or opposing elements, such as light and dark areas, warm and cool colors, or script and block typeface.

Relationship between tones on negative or print. The range of grey tones produced between black and white.

Show how things are different or opposite

Contrast is a value applied to highlights. High-contrast highlights are much lighter than the surrounding hair and provide a dramatic look. Lower contrast highlights result in a more natural look.

strong differences between light and darkness; visual effect involving the brightness of the image that can be edited by computer programs

The ratio between the maximum and the minimum luminance values of the display.

The relationship between the lightest and the darkest areas of an image. An image with deep shadows, bright highlights and few steps between the two is said to be high contrast. An image with weak shadows, dim highlights and many smooth steps between the two is said to be low contrast.

Used to compensate for very dark or very light documents, by lightening dark documents and darkening light documents.

The visual relationship between each tone in an image. High contrast will produce an abrupt and sharp difference in tones, when low the image will appear flat. (also see gamma)

A subjective feeling that graphic elements (such as fonts) are different but work together well. This gives a feeling of variety without losing harmony. Within a particular font, contrast also refers to the variety of stroke thicknesses that make up the characters. Helvetica has low contrast and Bodoni has high contrast.

the difference in brightness between the brightest highlight and darkest shadow.

The tonal gradation between the highlights, middle tones, and shadows in an original or reproduction.

The tonal change in color from light to dark.

The difference between the brightest and darkest parts of an image.

The difference between areas of shadow and light. Contrast may be emphasized to varying degrees, depending on the dramatic value that the artist wishes to give the picture.

In a television picture signal, the contrast is the difference in magnitude between the white and black components. Contrast is affected by the brightness of the picture. Too little contrast makes the picture appear washed out. Too much cntrast makes the words appear blurred.

An indication of the difference between the thicker and thinner parts of characters in a typeface.

An expression of the relationship between the high and low brightness of a document or the high and low density of microfilm.

This indicates brighter whites and blacker blacks as the number increases.

Set in opposition in order to highlight the differences

the degree of tones in a paragraph ranging from highlight to shadow.

An indication of the difference in brightness between the lightest and darkest areas of a scene, negative, slide, image or photograph. High contrast in a scene means a larger difference in brightness between the lightest and darkest areas as compared to low contrast.

The ratio of thickness of vertical to horizontal strokes in letterforms.

Amount of difference in reflectance between a dark area or bar and a light area or space of a symbol.

is the degree of tonal separation or gradation in the range from black to white. Extreme lights and darks give an image high contrast. An image with a wide tonal range has lower contrast.

How light and dark are recorded by the film. This is affected by the emulsion. (See emulsion below)

The degree of tones in an image ranging from highlight to shadow.

The difference between highlights and shadows in a photographic image. The larger the difference in density the greater the contrast.

Tonal gradation between the highlights, middle tones and shadows of images.

The amount of separation between Light and Dark Colors.

The difference in value or tone between highlight and shadow (background) on an image.

the emphasized difference between story elements pointed up by a juxtaposition of those elements to one another.

The difference between the highest level and the lowest level of luminance in a picture.

A secondary fabric used on chairs that accentuate features of the parsons chair. Contrast fabric is sometimes strikingly different such as a plaid contrast on a chair primarily composed of a solid color. Contrast is often applied to the welt and skirt blocks.

How far the whitest whites are from the blackest blacks. If the two are very close to each other, the image will appear washed out. If the two are very far apart, then the image is very stark.

The difference between the color of something and the background.

The amount of difference between the lightest and the darkest areas in a photo or artwork.

Dynamic use of movement/stillness, sound/silence and light/darkness.

The difference between elements in a photograph. Contrast can include the difference between light and dark areas, or a marked difference in colors.

The range of difference in the light to dark areas of a negative, print, or slide (also called density); the brightness range of a subject or the scene lighting. It may be also explained as tonal difference. More often used to compare original and reproduction.

The range of brightness between the darkest and brightest areas in a picture.

The difference between the light and dark parts of a scene or photograph.

(1) the range of difference between highlights and shadow areas in an image. Many factors affect an image's contrast, including the degree of development and the contrast grade of the paper on which an image is printed. (2) The range of brightness in a scene or in the light striking a subject. (Sometimes contrast is also referred to as "Density.")

The ratio of the darkest and brightest luminance levels a display can reproduce Page Top

The use of opposing elements such as light and dark, large and small, smooth and rough. Shows differences between elements such as the light and dark parts of a picture.

The effect of a striking difference in the form, line, color, or texture of the landscape features within the area being viewed.

The actual difference in density between the highlights and the shadows on a negative or positive. Contrast is concerned only with the difference in densities, not with the magnitude of density.

is the difference in the intensity between the black parts and white parts of the picture on the monitor.

is to compare as to point out the differences; set off against one another. Example: Purple is a darker colour than beige.

Range of brightness between the lightest and darkest portions of an image (difference between darkest and lightest parts of a picture); also a video display control that adjusts the white level and through this increases or decreases contrast.

The difference between light and shadow or various colors;

The difference in light level between the brightest parts of the image (the highlights) and the darkest ones (the shadows). High-contrast images show a stark difference between light and dark, while low-contrast ones are more muted.

Contrast is what often provides the "snap" we see in projected images. The added sharpness created from greater variations in adjoining pixels can mean the difference between a flat looking image and a crisp one. Compare the contrast ratios between products. The higher the ratio, the greater the contrast.

(1) The general term for describing the tone separation in a print in relation to a given difference in the light-and shade of the negative or subject from which it was made. Thus, contrast is the general term for the property called "gamma" (Y), which is measured by making an H & D Curve for the process under study. (2) The range of tones in a photographic negative or positive expressed as the ratio of the extreme opacities or transparencies or as the difference between the extreme densities This range is more properly described as "scale" or "latitude" (3) The ability of a photographic material, developer, or process as a whole to differentiate among small graduations in the tones of the subject. Black & White negative has "gamma" value between 0.60 and 0.70.

The difference between strong lighting and dark shadow effect. (See chiaroscuro effect)

A general term used to describe the tonal graduation between the highlights, mid-tones and shadows in an original or reproduced image.

A principle of art and design concerned with juxtaposing one or more elements in opposition, so as to show their differences.

A measure of the gradation in luminance that provides gray-scale (or color) information. Contrast is expressed as the ratio (difference in luminance)/(average luminance) in adjoining areas of the scene. Under optimum conditions, the human eye can just detect the presence of 2% contrast.

The art of assembling colors with different values and intensities and in different proportions to create a dynamic scheme.

How much brighter the white areas are than the black areas.

Contrast is a manual adjustment on a fax machine that compensates for very dark or very light documents by lightening dark documents and darkening light documents.

The difference between the darkest and lightest areas in a photo. The greater the difference, the higher the contrast.

Show how your subject is different from other things or ideas.

a substance which allows imaging of structures which cannot be seen using conventional imaging. Contrast may be swallowed, applied or injected. See x-ray contrast, barium, CT angiography or vascular ultrasound.

To compare or oppose two contrasting movements to show their differences. Movements might be different in terms of energy, space, design, or time.

A subjective judgment of the difference in brightness and density between shadow and highlight areas in an image. Contrast is affected by lighting, lens flare, film type, degree of development, enlarger type and quality of printing.

A measure of rate of change of brightness in an image. -High contrast implies dark black and bright white content; -Medium contrast implies a good spread from black to white; -Low contrast implies a small spread of values from black to white.

The difference of light intensity between two adjacent regions in the image of an object. Often expressed as the difference between the lightest and darkest portion of an image. Contrast between a flaw (or a feature) and its background is the goal of illumination.

the ratio between the maximum and minimum luminance (brightness) values of a display.

The degree to which the various luminance values in a picture are mapped to very dark and very light values. A high-contrast picture is dominated by black and white and few values between. A low contrast picture has a lot of middle tones without many very dark or very light areas. A control on a television or monitor which adjusts the white level of the picture.

in photography (either color or black and white), the range of tonal gradation between highlights and shadows- in other words, the comparative density of certain areas of the image. The farther apart the tones are, the higher the contrast.

In visual perception, contrast is the difference in visual properties that makes an object (or its representation in an image) distinguishable from other objects and the background.

The ratio between the dark and light areas of a television picture.

Contrast is the same as difference in density. Perceived contrast is the subjective impression of density differences in an image. The greater the differences, the greater the contrast is perceived to be. To a certain degree, perceived contrast is always affected by the psychological impact on the viewer made by the subject of the image. Contrast can be measured densitometrically to give the density range of the whole picture, or locally as a micro -measurement. Local contrast within a certain area is dependent on the sharpness of contours or acutance in that area. Consequently, the perceived sharpness of the image increases as the contrast increases.

The relative difference between the darkest and brightest parts of an image. A contrast control adjusts the peak white level of a display device.

in an image or scene, the amount of difference between the lightest and darkest areas.

Difference between two or more elements (e.g., value, color, texture) in a composition; juxtaposition of dissimilar elements in a work of art; also, the degree of difference between the lightest and darkest parts of a picture.

The amount of difference in reflectance between the dark bars and the light spaces on a bar code.

Difference of intensity between light and dark areas of a picture.

The tonal gradation between the highlights, midtones and shadows in an image.

A large difference between any two aspects within an artwork e.g. hot and cold, green and red, light and shadow.

The tonal change in colour from light to dark.

To set side by side to emphasize differences. In dance two contrasting movements might differ in energy; space (size, direction, level); design (symmetrical/asymmetrical, open/close); timing (fast/slow, even/uneven); or two or more different themes or patterns.

1. In dance and drama, pairs such as darkness and light, sound and silence, and movement and stillness. 2. In visual arts, a principle of art and design that juxtaposes strongly differing uses of one or more of the elements for effect.

Refers to the relative difference between two luminance values. There are two general formulas for specifying luminance contrast. One is the ratio of the difference between the luminance of print and the luminance of the background to the luminance of the background; this formula is commonly used to specify the luminance contrast of printed text and visual acuity charts. Another formula that is used to specify the contrast of gratings is the ratio of the difference between the maximum and minimum luminance in the grating to the sum of the maximum and minimum luminance values.

Refers to the special case of contrast where the difference between the contrasting regions is in the wavelengths of the stimulating light. Color contrast is sometimes used to supplement luminance contrast. Color contrast is a phenomenon of photopic vision, since it depends on the cone photoreceptors of the human eye. Color contrast does not exist at scotopic light levels, since the rod photoreceptors do not support color vision.

Measures the difference in brightness throughout an image. High contrast refers to extreme white and black differences whereas low contrast implies a small difference between the two.

to compare two persons or things so as to show the differences between them

The relationship between the brightest intensity on a display and the dimmest. In an infrared system this may adjust the temperature range on the display. Increasing and decreasing the display range of temperature will change the apparent brightness difference between two different temperature values.

A dye or substance used in various imaging exams to make body parts more visible. It may be administered intravenously, orally or rectally.

The tonal gradation between highlights and shadows in an image. High contrast features extreme light and dark areas.

Range of gradations in tones between lightest white and darkest black in continuous-tone copy or the abrupt change between light and dark in line copy.

subjective judgment of the difference between densities or luminosities and their degree of tonal separation in a subject, negative or positive print.

The ratio of the luminance or light coming from an object and the luminance of its immediate background.

A measure of the differences of color and brightness in an image.

The range between the lightest and darkest tones in an image.

The tonal gradation between highlights, middletones, and shadows in an original or a reproduction. The visual relationship of the original to the reproduction when comparing white to black ranges.

A dissimilarity between two or more colors. Value contrast is based on the relative lightness or darkness of the colors being compared; color contrast is based on their relative position on the color wheel.

The difference in brightness (luminance) of an object and its background.

The difference in intensity between the lightest and darkest image viewed through the optical system.

The difference between two objects or areas in a work e.g. light values and dark values, high chroma and low chroma, hard edges and soft edges.

In meteorological usage, contrast is defined by where 0 is the luminance of a target object and is that of its immediate visual surroundings. Both luminances may include airlight or reflected glare, and is always assumed to be greater than zero. Because detection outdoors often depends on luminance rather than chromaticity differences, is usually calculated from spectrally integrated luminances. Contrast for a perfectly black target is −1 but, in principle, has no upper limit for a self-luminous target. If is less than a variable threshold contrast, the target is visually indistinguishable from its surroundings.

The difference in light intensity between the brightest highlights and the deepest shadow on an image.

The difference in tone between different colours. The higher the contrast between two colours, the more eye-catching an image becomes. A high contrast example would be that between black and white. Contrast is an important factor to making a great logo.

The difference between the dark and light areas of an image. The lower the number value, the more closely the shades will resemble each other. The higher the number, the more the shades will stand out from each other. Speed of density change; graduation.

the difference in darkness or density between one tone and another

Optical contrast is the ratio of the amount of light falling on the receiver in the "light" condition as compared to the "dark" condition. Optimizing contrast in any sensing situation will increase the reliability of the sensing system.

The degree of difference between a subject's tones, which is a function of its inherent shades and colors and also the quality of light.

In literature, an author writes contrast when he or she describes the difference(s) between two or more entities. For example, in the first four lines of William Shakespeare's Sonnet 130, Shakespeare contrasts a mistress to the sun, coral, snow, and wire.

Various definitions of contrast are used in different situations. Below, luminance contrast is used as an example, but the formulas can also be applied to other physical quantities.

Contrast is the difference in visual properties that makes an object (or its representation in an image) distinguishable from other objects and the background. In visual perception of the real world, contrast is determined by the difference in the color and brightness of the object and other objects within the same field of view. Because the human visual system is more sensitive to contrast than absolute luminance, we can perceive the world similarly regardless of the huge changes in illumination over the day or from place to place.

In statistics, particularly analysis of variance, a contrast is a linear combination of two or more factor level means (averages) such that the coefficients add up to zero. A simple contrast is the difference between two means. http://www.itl.nist.gov/div898/handbook/prc/section4/prc426.htm Ref.

The dye injected during a CT or an MRI scan