Curve that describes how the middle tones of images appear. Gamma is a nonlinear function often confused with "brightness" and/or "contrast." Changing the value of the gamma affects middle tones while leaving the white and black of the image unaltered. Gamma adjustment is often used to compensate for differences between Macintosh and Windows video cards and display.
The contrast of photographic images.
A measurement of the midpoint in the luminance range of an image. Used in color adjustments to control the proportions of brighter and darker areas in an image. Also called the gray point.
Is a measurement of the how the image brightness changes with the input signal level.
gamma measures contrast that effects midtone grays. It is a logarithmic correction to the computer's linear representation of tone which better approximates the way people actually see dark to light tones.
On a monitor gamma is the relationship between the input voltage and the output luminance. Device gamma is the degree to which the device is non-linear in its tonal behavior.
(Engine) The lighting scale applied to the video output from the engine. Raising the gamma level usually results in a brighter, more luminous output at the expese of contrast. Lowering the gamma level usually results in a darker output with deeper tones.
A measure of contrast that affects the mid-range grays (midtones) of an image. Gamma is often expressed as a curved or straight slope.
The logarithmic brightness value assigned to video monitors to allow replication of the logarithmic visual range of the eye.
Properly adjusting the monitor gamma insures that printed output will be of the same intensity as the displayed image. Monitor gamma can be found in the File Menu (sub) Preferences (sub) Monitor Gamma. There is also a gamma correction for each image. From the Colors Menu (sub) Adjust (sub) Gamma Correction.
The light output of a CRT is not linear with respect to the voltage input. The difference between what you should have and what is actually output is known as gamma.
Tonal value breadth of an image.
Gamma is a measure of the contrast of a negative and it is symbolized by the Greek character g. Gamma is the slope of the straight-line portion of the curve. Slope refers to the steepness of a straight line, determined by taking the change in density from two points on the curve and dividing that by the change in log exposure for the same two points. Degree of developing affects the steepness, or contrast, of the curve. If we change the degree of development, the relationship between exposure and the degree of darkening also changes.
A term describing the relationship between input densities and output densities to measure how compressed or expanded dark or light shades become in an image.
The brightness of mid-level tones in an image. More precisely, a parameter that describes the shape of the transfer function for one or more stages in an imaging pipeline. The transfer function is given by the expression output = input ^ gamma where both input and output are scaled to the range 0 to 1.
A parameter describing the curve of amplitude response (level response) according to the expression
The relationship between the voltage input and the brightness of a monitor. An important factor in calibration as monitors have to compensate for gamma to get the desired on-screen grey values. The standard gamma on Windows is 2.2, and on Mac 1.8.
A numerical value used to express contrast levels in television pictures. A value of one (1) indicates a linear characteristic. Less than one indicates a curve or less contrast levels represented by a softer looking picture. The standard for a camera is .45 and for monitors is .55.
Refers to the overall brightness of a computer monitor's display.
Midpoint in tonal range generally used in histogram.
Different platforms like PC, Mac, UNIX interpret color values slightly different. An images that look dark on a PC might look bright on a Mac. The Gamma Correction is a way to explain how to an image should be displayed.
A measure of the contrast in a photographic image or display; the ratio of the density range of a negative to the density range of the original.
The amount of brightness in a screen
curve that describes how the middle tones of images appear. Often confused with "brightness" and/or "contrast", gamma is a non-linear function. Changing the value of the gamma affects middle tones while leaving the white and black of the image unaltered. Gamma adjustment is used to compensate for differences between Macintosh and Windows video cards and display.
All photographs have a characteristic called gamma. The amount of gamma present in an image is measured as the contrast that affects the mid-level grays (the mid tones) of an image. The good news for digital imagers is that this gamma is adjustable by most image-enhancement programs, and you aren't stuck with the gamma that is present in the original negative or print.
The mid-tones or mid-level grays of an image. In image editing this is typically represented by a "curve" tool. The x-axis represents the original brightness values (0-255) and the y-axis represents any modifications.
The values produced by a monitor from black to white are nonlinear. If you graph the values, they form a curve, not a straight line. Gamma defines the slope of that curve at halfway between black and white. Gamma adjustment compensates for the nonlinear tonal reproduction of output devices such as monitor tubes. Gray Gamma 1.8 matches the default grayscale display of Mac OS computers. Gray Gamma 2.2 matches the default grayscale display of Windows computers.
Gamma is a value that expresses the relationship between the input and output of a device. By adjusting the gamma, the brightness of the mid-tones of an image can be changed without affecting the shadows and highlights.
The way in which dark or light shades are measured in a photographic image. The measure of the image contrast, changing the midtone placement rather than the endpoints.
1) A measure of contrast in photographic images. Film types are listed as creating certain gamma ranges appropriate to different uses. 2) In electronic color correction, the difference in the status of the color curves. The color curve represents highlight to shadow values between current values and corrected values. Changing the color curve (making a gamma correction) increases or decreases the highlights, midtones, and shadows relative to the original points on the curve.
The light output of a CRT is not linear with respect to the voltage input. This non-linearity follows an exponential function called "Gamma".
The measurement of the difference between a target brightness and the brightness achieved. Gamma effects the amount of contrast which is displayed.
The transfer characteristic of light input to light output of the television system. Many components in the television system introduce unequal light response and must be corrected.
A correction of the linear response of a camera in order to compensate for the monitor phosphor screen nonlinear response. It is measured with the exponential value of the curve describing the non-linearity. A typical monochrome monitor’s gamma is 2.2, and a camera needs to be set to the inverse value of 2.2 (which is 0.45) for the overall system to respond linearly (i.e., unity).
The contrast in photographic images.
A setting that controls image contrast by modifying the mid-tones and mid-level grays.
Informally, a measure of the brightness of mid-level tones in an image. Outside this specification, the term "gamma" is often used as the exponent of a power function that is the transfer function of any stage(s) of an imaging pipeline: output = input ^ gamma where both input and output are scaled to the range 0 to 1. Within this specification, gamma refers specifically to the function from display output to image samples.
level of gamma correction
The measure of how compressed or expanded the dark and light shades become in an image.
Refers to the midtone contrast in an image, or on a display. Gamma values will affect the balance of the midtones without any effect on pure white or black.
The contrast ratio between the input and output of the camera. The contrast gradient.
In computer graphics and digital video, this refers to a numerical parameter that describes the nonlinearity of intensity reproduction. Basically, as colors...
By means of the gamma curve, the color/gray distribution for all tones between black and white can be represented.
A mathematical curve representing both the contrast and brightness of an image. Moving the curve in one direction will make the image both darker and decrease the contrast. Moving the curve the other direction will make the image both lighter and increase the contrast.
For a CRT device, the slope of the line relating the logarithm of the light output to the logarithm of the applied voltage.
Screen luminance as a function of video voltage approximately follows a mathematical power function of the input video signal, the exponent of which is called gamma.
A small change in voltage when the voltage levels are low of a display produces a change in the brightness level. This same change at high voltage does not produce the same magnitude of change. The difference between what you should have and what you actually get is known as Gamma.
A way of representing the contrast of an image, shown as the slope of a curve showing tones from white to black.
The exponent of the function relating output signal to input signal in video cameras and monitors. Industrial CCD cameras naturally have a gamma of 1, that is, they are linear in response. CRT displays, however, have a nonlinear response corresponding to gamma values between 2 and 3. When used together the camera may incorporate gamma correction to linearize the resulting system.
The relationship between the input video signal to a display and the screen output luminance Page Top
A term used to describe the amount of contrast in a picture generated from a camera. Gamma correction within a camera allows the camera/monitor system to reproduce accurate contrast levels equal to the viewed scene.
Relationship between the original scene as filmed and input into a video display to the image actually produced on the video display.
A measure of the amount of contrast found in an image according to the properties of a gradation curve. High contrast has high gamma and low contrast low gamma.
Slope of the line that represents image output values versus image input values. Used to describe the contrast of a monitor or scanner.
A numerical value, or the degree of contrast in a television picture, which is the exponent of that power law which is used to approximate the curve of output magnitude versus input magnitude over the region of interest.
Gamma refers to the intensity and brightness of intermediate color values. Creative cameras offer colour balance, bringing true to life colors to your video-conferencing.
Degree of contrast in a video picture between output magnitude and input magnitude.
Curve that describes how the middle tones of images appear. Gamma is a nonlinear function often confused with "brightness" and/or "contrast." Changing the value of the gamma affects middle tones while leaving the white and black of the image unaltered. The characteristics of displays using phosphors (as well as some cameras) are nonlinear. A small change in voltage when the voltage level is low produces a change in the output display brightness level; but this same small change in voltage at a high voltage level will not produce the same magnitude of change in the brightness output. This effect, or actually the difference between what you should have and what you actually measured, is known as gamma. The compensation is often referred to as the inverse of the classical bathtub curve.
The Gamma contrast allows you to adjust the mid-tones in an image. You can select from 50 (lowest) to 500 (highest) by moving the slider.
A mathematical curve representing both the contrast and brightness of an image. The steepness of the curve indicates greater contrast calculated as a trigonometric tangent function.
The contrast affecting the mid-level grays or midtones of an image. Adjusting the gamma of an image allows you to change brightness values of the middle range of gray tones without dramatically altering the shadows and highlights.
The measure of the contrast of an image or imaging device.
The range of color values a monitor, scanner, or printer can display. Adjusting this value increases or decreases the intensity of the light spectrum. A gamma corrected image simulates the adjusted display value when it is saved.
A measure of contrast in photographic images. A densimetric evaluation of graph paper indicating highlight to shadow contrast in terms of density values, plotted on a graph to establish the maximum and the minimum, the difference between them being the gamma.
measurement used in sensitometry to describe the angle made between the straight line portion of the characteristic curve of the photograph emulsion and the base of the graph. The gamma is the tangent of the angle so formed.
A numerical specification of the relationship between video signal level and image brightness. Gamma is important both in video cameras (and video encoding of movies) and in video displays. Ideally, the gammas of recording and playback devices should be identical. In practice, displays normally have to incorporate some correction to compensate for how they inherently translate video levels into light levels. Otherwise, some scenes or parts of scenes would appear darker or lighter than they should. This is especially problematic for display technologies, like LCD, that cannot produce true black. It’s hard to achieve a single gamma setting that looks right for all input signals, especially if they originate in different media (like film, video, and computer graphics).
In film and video production, a number indicating the degree of brightness of an image. See also gamma correction.
Scanners. A mathematical function used to describe the relationship between input densities (levels) and output densities (levels.) The measure of how compressed or expanded dark or light shades become in an image.