Tektronix SPG8000A, User Manual

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108 SPG8000A User Manual
Signal set Signals in the signal set Description
intermediate colors will show as a hexagonal shape on a
vectorscope display, providing a reference for comparison with a
camera-generated image of a physical DSC ChromaDuMonde chart.
The pattern also includes an 11-step crossed grayscale section and
a center section with 0% Black and 100% white patches.
SMPTE 303M Color Reference Color reference chart according to SMPTE 303M, also known as
the GretagMacbeth ColorChecker® chart. Cyan patch #18 cannot
be reproduced properly in the RGB and XYZ color spaces because
the red component lies at approximately −14%, which exceeds legal
limits for RGB formats. This patch will appear as a cyan and Black
checkerboard pattern, where the cyan patches are of a different hue
than the full cyan patch as seen in YCbCr formats because the red
component is clipped at 0%. The color values used from SMPTE
303M are those with respect to the D
65
illuminant.
Black-White Step Scale
Black-Dark Gray Step Scale Gray scale patterns according to §6.9 of SMPTE EG 432-1-2007. A
series of ten different monochrome patches at increasing luminance
values is centered on a gray background, to verify gray scale
tracking. The ten steps of the Black to white scale are normalized
gamma-corrected values of 1/10 to 1 and the ten steps of the Black
to dark gray scale are 1/31 to 10/31.
Pluge and Luma Reference Includes two elements to help in Black and white balance. The left
side of the pattern contains a pluge pattern, with three vertical bars
of −2%, 0%, and +2% Black. The r ight side of the pattern contains
four gray boxes corresponding to luminance levels of 110 mV, 200
mV, 450 mV, and 700 mV (100% white) in the analog domain. The
−2% patch of the pluge section is clipped to 0% Black for XYZ
formats.
Checkerboard 4×4 grid of alternating Black and white patches, used to measure
intra-frame contrast according to §6.8 of SMPTE SMPTE EG 432-1-
2007.
Window White square centered on a Black background. This pattern can
be used as an alternative to a full-field white pattern when it is
useful for the average picture level (APL) to approximate normal
program content.
Production Aperture Includes single-pixel wide lines at the extreme edges of the active
video area, marking the complete production aperture. Vertical lines
are implemented as single-sample pulses with no edge filtering, so
this pattern is not legal as a broadcast signal.
Clean Aperture Grid pattern according to SMPTE RP 187-1995. The clean
aperture is marked by the outer markers, with overscan markers at
approximate 2.5% increments. The center 4:3 section of a 16:9
image has an additional set of aperture and overscan markers.
Each line on the grid is implemented with two horizontal lines or a
double-width pulse centered on two samples, because the actual
aperture boundary and the center of the image each lie midway
between lines and samples.
Convergence Grid pattern of equal size squares with a dot at the center of each
square. Each line and dot is implemented as a single horizontal line
or single-sample pulse. This pattern is used to verify convergence of
RGB channels, and no color fringing should be visible on the white
lines and dots when the channels are aligned.
Pulse Bar 2T Pulse and Bar Two pulses of 2T half-amplitude width and full-scale amplitude. A
positive pulse is added to a base level at the minimum valid value,
and a negative pulse is added to a bar level at the maximum valid