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Standard SMPTE cinema screen luminance [10] 80 cd/m 2: Monitor white in the sRGB reference viewing environment 250 cd/m 2: Peak luminance of a typical LCD monitor [11] [12] 700 cd/m 2: Typical photographic scene on overcast day [7] [9] [12] 10 3: kcd/m 2: 1 kcd/m 2: Cloudy sky at noon [4] [12] 2 kcd/m 2: Average cloudy sky [5] [12] 2.5 kcd/m 2 ...
Luminance only, Chrominance only, and full color image. Chrominance ( chroma or C for short) is the signal used in video systems to convey the color information of the picture (see YUV color model), separately from the accompanying luma signal (or Y' for short).
For instance, if the red, green, and blue colors in a monitor are measured exactly, together with other properties of the monitor, then RGB values on that monitor can be considered as absolute. The CIE 1976 L*, a*, b* color space is sometimes referred to as absolute, though it also needs a white point specification to make it so.
Suppose the image consisted of alternating 1-pixel red and black lines and the subsampling omitted the chroma for the black pixels. Chroma from the red pixels will be reconstructed onto the black pixels, causing the new pixels to have positive red and negative green and blue values. As displays cannot output negative light (negative light does ...
The correlate for red–green (a) is the magnitude of the departure of C 1 from the criterion for unique yellow (C 1 = C 2 / 11), and the correlate for yellow–blue (b) is based on the mean of the magnitude of the departures of C 1 from unique red (C 1 = C 2) and unique green (C 1 = C 3).
In all formats other than Y′IQ, each chroma component is a scaled version of the difference between red/blue and Y; the main difference lies in the scaling factors used, which is determined by color primaries and the intended numeric range (compare the use of U max and V max in § SDTV with BT.470 with a fixed 1 / 2 in YCbCr § R'G'B ...
The level of a video signal usually corresponds to the brightness, or luminance, of the part of the image being drawn onto a regular video screen at the same point in time. A waveform monitor can be used to display the overall brightness of a television picture, or it can zoom in to show one or two individual lines of the video signal.
Red versus green; Blue versus yellow; Black versus white (this is achromatic and detects light–dark variation or luminance) [3] Responses to one color of an opponent channel are antagonistic to those to the other color, and signals output from a place on the retina can contain one or the other but not both, for each opponent pair.