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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
Two signals are said to be color framed at a switcher or router when their field 1, line 10 events (field 1, line 7 in PAL) occur at the same time at the input to the switcher or router. To prevent picture distortions when changing signals at a switcher or router, the signals must be color framed.
Industry:Entertainment
The luminance produced on the monitor display by a signal at reference black level. Since the monitor brightness control should be adjusted to align CRT beam cutoff with reference black level signal, this provides zero excitation light from the CRT (only room ambient light reflected from the CRT faceplate). Monitor black level is normally set by use of a PLUGE signal to adjust CRT beam cutoff subjectively.
Industry:Entertainment
In a system employing three color primaries to encode image color, each primary can be located on a CIE chromaticity diagram and these points connected as a plane figure. If the apexes are then connected with an appropriate value on the white point axis, a so) id figure is produced enclosing the color gamut for that system. (On the CIE chromaticity diagrams, the points in x, y, z space approximate an inverted tetrahedron.
In u, v, w space, they become a somewhat irregular four-cornered solid.) Colors within the color gamut solid volume can be reproduced by the system as metameric matches. Colors outside the color gamut solid volume cannot be matched. Note: The area of the cross-section from the color gamut solid is a function of the luminance. Although it is advantageous to have the widest possible color gamut for the ability to provide metameric matches for the largest number of colors, the required transformations from origination colorimetry to colorimetry matched to available display primaries, for example, may require large matrix coefficients and, therefore, a signal-to-noise penalty. The choice of color gamut is a compromise between color rendition and signal-to-noise.
Industry:Entertainment
The video signal level which is intended to produce monitor black level in the reproduced image. In systems with a setup level, i.e., the 7.5 IRE setup in a 525/59.94/2:1/NTSC composite video documented by ANSI/EIA TIA 250-C and SMPTE 170M, reference black is at the setup level. In systems with no setup level, reference black is at blanking level.
Industry:Entertainment
The maximum excursion of the picture signal black direction at the time of observation.
Industry:Entertainment
Circuitry which disables the receiver’s color decoder if the video does not contain color information.
Industry:Entertainment
a) Optical black is no light. An absolute black can only be produced in a scene via a light-trap, “a black hole.” b) A capped lens on the camera is the equivalent of an absolute scene black and should produce reference black level video signal from a properly adjusted studio camera.
Industry:Entertainment
The CLUT is a compression scheme where pixel values in the bitmap represent an index into a color table where the table colors have more bits-per-pixel than the pixel values. In a system where each pixel value is eight bits, there are 256 possible values in the lookup table. This may seem a constraint but, since multiple lookup tables can be referenced, there can be many tables with varying 256 color schemes. CLUTs work best for graphics where colors do not have to be natural.
Industry:Entertainment
The luminance level in a projected image that is correlated with subjective scene black has two sources: in photographic and other light-modulating systems there will be luminance from whatever transmitted light passes through the maximum modulating density representing scene black, additional luminance may be produced by nominateforming light (flare, room illumination, stray light, etc.).
Industry:Entertainment
