Gray Level
The brightness of a pixel. The value associated with a pixel representing it's lightness from black to white. Usually defined as a value from 0 to 255, with 0 being black and 255 being white.
gray levels
the number of steps available to reproduce a color in an imaging system. Typically, in an 8 bit system there are 256 gray levels per color.
Gray level
A shade of gray assigned to a pixel. The shades are usually positive integer values taken from the gray-scale. In a 8-bit image a gray level can have a value from 0 to 255.
I have done some measurements on gray level across line boundaries in images processed by Phase One (raw images only) and I was unable to detect a shift in the gary level by more than 2 GL for a ful range sharpening.
random()*10000000000000000; to white (value 255) with 254 gray levels in between.
Even more so some of the comments explaining the gray level. I had to figure out how to read this meter myself with trial and error. A few notes that inspired me to wtite this comment. The +/- are reveresed on my Nikon.
Figure: Grouping by color (or gray level, left ) and form (right)
See also the guest editorial in Perception 11/1997 (vol. 26)"Colour in a larger perspective: the rebirth of Gestalt psychology"
GIF ...
For each pixel the gray level (a value between 0 and 255) represents the pixels's Alpha value. An alpha channel can make areas of the layer to appear partially transparent. That's why the background layer has no alpha channel by default.
A measurement of the accuracy of an image in color or gray level. More bits of dynamic range results in finer gradations being preserved.
A
B ...
The black-and-white image was digitized using a scanner, and a computer program was used to assign the contributions of the three primary colors to each of many gray levels.
There can be up to 256 shades of gray in an 8-bit image. Each pixel has a brightness value ranging from 0 (black) to 255 (white). The shades (gray levels) of the converted pixels represent the luminosity of the original pixels.
Grayscale images are distinct from black-and-white images, which in the context of computer imaging are images with only two colors, black and white; grayscale images have many shades of gray in between. The 256 gray levels system divides the gray ...
In contrast, computer hardware and software is digital, which means that they can represent only a limited number of colors and gray levels. Converting a black-and-white continuous-tone image into a computer image is known as gray scaling.
Composed Files: A PostScript file that represents color pages containing picture elements specified in terms of red, green, and blue (RGB) or cyan, magenta, yellow, and black (CYMK) color space, as opposed to black and white "gray level" pages ...
 See also: Gray, Image, Light, Color, Digital
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