Light Value (LV) and Exposure Value (EV) are numerical scales for measuring the amount of light, and the exposure, respectively.
Light value
A composition made up of tints, displays an overall light value.
Medium value
A medium value composition is made up of a balance between tints, saturated hues, and shades.
Dark value ...
Light value - alternative term for exposure value (EV).
Limiting aperture - actual size of the aperture formed by the iris diaphragm at any setting.
Tint
Tints are light values of a color. One usually makes tints by mixing a color with different amounts of white.
Shade
Shades are dark values of a color. One usually makes shades by mixing a color with different amounts of black.
To set the red highlight value, the White Input Slider is moved to the left while holding down the Alt Key. Initially, the image will turn black.
An exposure value which takes into account the ISO sensitivity is called "Light Value" or LV and represents the luminance of the scene (2).
Not only are light values represented by negative densities but colors are represented negatively by their color complements. (PIA) NEUTRAL-Hueless or achromatic color; gray. Chem- ically, a solution that is neither acid nor alkaline.
The greater apparent detail in this image is the result of compressing the midrange of the light values a bit in the computer.
He said109 "I just decided that solarization does not have the power to create the subtle and beautiful light values and the nuances that a straight photograph has. I don't think solarization has the power to create this realism.
When properly exposed, images where the main subject contains a lot of white can be very dramatic as the subject becomes more pronounced due to its light value.
Proper exposure does not mean some magical light value or perfectly centered light meter needle. Proper exposure is whatever the photographer intended for the scene in question.
Average metering takes all of the light values for a given scene - highlights, shadows, and mid-tones - and averages them together to establish a good overall exposure. Average metering is best used for front-lit subjects.
Exposure value
Gray card
Light value
Multiple exposure
Sensitometry (and Hurter-Driffield curves)
Night photography
Long exposure multiple flash photographic technique
Light Painting ...
0 (OK, just pretend for the time being that you have such a lens) with the ISO set to 100 and point the camera at something that makes the meter read dead even on zero, we are seeing a Light Value of LV 0. Switch five stops to a more reasonable f/5.
Center-weighted meter. A through-the-lens exposure meter that measures light values from the entire scene but gives greater emphasis to those in the center of the image area.
In an image like this one, there is a huge range of light values, from the bright sun to almost black at the bottom. Knowing that your camera's meter is trying to create 18% gray out of this mess, you need to help it make the right choice.
A print is wrapped around a cylinder and scanned by a small spot of light. Reflected light values are transmitted as a stream of signals.
Here, you can see the numbered samplers at the bottom showing the dark value at R=19, G=8, B=9 and the light value at R=255, G=245, B=235, although these no doubt will be different on your photograph.
Information about the colour scale and other relevant data (such as light values, colour saturation, colour balance, contrast etc.) are recorded in the Exif file header and can then be used by P.I.M. compatible printers when printing.
In the case of still images the samples are measures of the red, green and blue components of light falling on an array of discrete sensors. Video in a sense combines the two, measuring light values at siecific moments in time.
 See also: Light, Value, Camera, Image, Exposure
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