Lightness
Lightness is the perceived reflectance of a surface. It represents the visual system's attempt to extract reflectance based on the luminances in the scene. (From Adelson, MIT) ...
Lightness - See luminance.
Lossless compression - A type of file compression that reduces file size without losing image date. PNGs and GIFs are common lossless file formats.
lightness
equals value of color; perception by which objects are distinguished from gray objects and light from dark objects.
lightweight
a class of fabric made of 26 or 28 single yarn.
Lightness: Property that distinguishes white from gray or black, and light color tones from dark color tones. In color space, lightness/darkness is the center axis. Also called value.
Master Lightness works essentially like a standard Curves dialog but operates on the raw (linear) data before conversion.
Lightness and Luminosity
In any color image, there is both tonal and color information. We often see the color information represented by the values of the three primary colors (red, green, and blue).
lightness: common are wooden bellows camera constructions
often fewer or more limited movements, especially when compared to monorail cameras
field cameras are well foldable for portability ...
Lightness value of a pixel from black (0) to white (255).
Buffer
Temporary memory storage. A digicam without adequate (or any) buffer will force you to wait until the image is written to the memory card before you can take another shot.
Value: lightness and darkness of the color - the amount of white or black added.
Intensity: the purity or saturation of the color
Monochromatic color: use of one color where only the value of the color changes ...
Exposure or lightness and darkness in the picture is a combination of the F-stop, which is the size of the hole in the lens, and the shutter speed, which is the length of time that the shutters open.
Using Master Lightness, a traditional lightness curve, it's possible to apply an overall change of lightness together with changes in luminance, chrominance and hue for specific portions of the spectrum.
The relative lightness and darkness of a color or tone.
VGA:
Short for Video Graphics Array; defined by IBM; represents a computer-graphics adapter capable of 640 by 480 resolution. Also see SVGA.
The degree of lightness or darkness in any given area of a print; also referred to as value. Cold tones (bluish) and warm tones (reddish) refer to the color of the image in both black-and-white and color photographs.
Toning ...
Luminance
Lightness. The highest of the individual RGB values plus the lowest of the individual RGB values, divided by two; a component of Hue-Saturation- Lightness image.
Acronym for Hue/Lightness/Saturation. See HSI.
horizontal frequency
Measure of the speed at which the electron beam in a monitor sweeps across the width of the active area of the screen. Usually expressed in kilohertz (kHz).
Density - The lightness or darkness of an image or a portion of an image.
Desaturate - To remove color from an image or hue.
Luminance - The lightness or luminance of a color is similar to its value or brightness but the two are not the same thing. In the physical world, luminance is the physically quantifiable intensity of light measured in energy per unit area.
HUE-That attribute of certain color perceptions in respect to which they differ characteristically from the gray of the same lightness and which permits them to be classed as reddish, yellowish, greenish, or bluish.
7 Click (highlight) the lightness channel.
8 Under the Image menu, select Mode>Greyscale (discard colour information).
9 Command click on the grey channel (to load the selection).
10 Under the Select menu, choose Image>Inverse to select the shadows.
Digital image pixel tonality (darkness<>lightness) for 24 bit RGB color is expressed as a number between 0 and 255. 0 equals pure black and 255 equals pure white. The mid point at about 127 would be the equivalent of middle gray in density.
For digital photo cameras ("digital still cameras"), an exposure index (EI) rating-commonly called ISO setting-is specified by the manufacturer such that the sRGB image files produced by the camera will have a lightness similar to what would be ...
Hue is unique in one respect, it is the actual color, as measured by its wavelength, while the other two characteristics (saturation and lightness) modify the hue in some way.
Incident meters measure the light falling on the subject and are not affected by the subject lightness or darkness, or its color. Black is recorded as black, and white records as white.
I don't recommend to use the Hue / Saturation / Lightness sliders in Photoshop. Changing one slider will usually affect the other two settings.
So, basically, the histogram's left to right directions are related to the darkness and lightness of the image, while the up and down directions of the histogram (valleys and peaks) have to do with color information. I repeated this for emphasis! ...
Stops are a relative measure of lightness: you can't say "there are three stops of light coming from that surface", but you can say that one surface is three stops brighter than another.
Using the Hue, Saturation and Lightness controls, change the color of the flowers to your liking. I changed the flowers from yellow to pink by setting the Hue at -111, the Saturation at -49 and the Lightness at +33.
My camera of choice is the Canon 350D (aka Digital Rebel XT), due to its compact dimensions, lightness and excellent image quality.
Lastly, lightness makes it brighter, or darker. Simple, but very powerful. Just follow the values in the picture if you want to follow what I am doing, or feel free to do your own thing.
It is based on color opponency with three primaries: L* representing lightness, a* represents red-greenness, and b* represents yellow-blueness.
With the small size and lightness of digital cameras, you can include one of your hands with a favorite toy in the frame, while you shoot very interactive pet photos with the other hand.
Luminance refers to the lightness or perceived brightness of the colors we are targeting in the HSL panel.
- color value measures lightness or darkness of a color;
- saturation or intensity is the brightness or dullness of a color;
- chroma is how pure a hue is in relation to gray; ...
YUV color space Y stands for the luminance (lightness) information, and is compatible to black&white (and gray) signal.
This determines the lightness or darkness of an image and can be controlled manually by the photographer or automatically by the camera or by a combination of the two.
Convert the color file to Lab by going to the Image menu, choose Mode, than Lab Color. Activate the Lightness channel by going to Window manual and choosing Show Channels. Click on the Lightness Channel. It will appear highlighted.
Elizabeth is normally quite tan. However, the lightness of her skin in this particular session competed with th evariety of pinks surrounding her. So I used a warming filter on my lens to create a bit more brown in her skin tone.
Why Shop Here ...
Instead of Red, Green, and Blue, LAB Curves are L-Lightness, a--Red/Green and b--Blue/Yellow. Simple moves in the a or b channel Cuves can quickly enhance specific colors in specific directions.
The tool is typically made of three controls: Hue (actual color), Saturation (the intensity of color) and Lightness (a combination of contrast and brightness).
Continuous-tone printers can print each dot at many different shades of lightness and darkness.
Set the saturation slider to -100 to remove all color from the selected area. If you need to adjust the lightness or darkness of the now black and white area, you may use the lightness slider for that adjustment.
TONE - also known as "Value" - The degree of lightness or darkness, or color variation from cold tones (blues) to warm tones (reds), in an area of a print, whether a color print or a black-and-white print.
Move the Lightness slider to the right to brighten the grey tones of the leaves. You can refine the exact shades of yellow affected by selecting the Eyedropper tool and clicking on an area of foliage.
A color is described in three ways: by its name, how pure or desaturated it is, and its value or lightness.
Color Booster (people / nature, level, auto)
Size / Resolution (resize, change ppi)
Photo Effects
Noise Reduction (optional edge noise reduction)
LCH Editor (master lightness, color lightness, chroma, hue)
RAW only adjustments (.NEF) ...
The value of a pixel in an electronic image, representing its lightness value from black to white. Usually defined as brightness levels ranging in value from 0 (black) to 255 (white).
Buffer ...
On the basis of the distance of the motif, the focal length, the aiming of the camera (thanks to the orientation sensor) and the lightness of the motif makes it possible for the DIGI respectively iSAPS to make a profil from the motif and compare it ...
The value assigned to a pixel in the HSB model to define the relative lightness of a pixel
Bridge
Adobe's file browser that ships with Photoshop ...
Grey Level. This is the brightness level of a pixel representing it's lightness from black to white. It is usually defined as a value from 0 to 255, with 0 being black and 255 being white.
Tone: The degree of lightness or darkness on a print.
Underexposure: The muddy, dark areas of a photograph due to too little light reaching the film.
Tone
A photographic term that refers to the strength of grays between white and black. It relates to the brightness, lightness and darkness of the subject and is determined by illumination.
Search SWPP and BPPA ...
A histogram usually contains densely arranged columns that represent the lightness or darkness of the photo.
-Tone - refers to the strength of grays between white and black. It relates to the brightness, lightness and darkness of the subject and is determined by illumination.
8.Once done, it's time to sharpen the image. First, choose the Image menu and select lab color in the Mode selection. Now, go to the channel window and choose lightness channel. Then, go to the Filter menu and choose Unsharp Mask under Sharpen.
A scene may seem very interesting, but if the composition relies on color contrasts, often times when it is rendered in grays, it falls flat. An orange and a blue hue can have the same value, or darkness/lightness.
Sponge tool. Used for saturating or desaturating part of a digital photograph, that is exaggerating or lessening the color component as opposed to the lightness or darkness.
Add a Curves layer to control contrast, and a Hue-Lightness-Saturation layer with Colorize to correct the "cold" look. Then play with the opacities of the layers to control the look of the "print."
Finish.
Now, click on "Add New Layer" (the half black/half white circle icon at the bottom of the layers pallet); select hue/saturation layer; and finally use the hue and saturation sliders to get the best look. You can also use the lightness slider to ...
 See also: Light, Image, Camera, Photograph, Digital
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