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SMPTEbar
Description: This image is based on an engineering guideline
(EG1-1990) test signal specified by the Society of
Motion Picture and Television Engineers (SMPTE).
The SMPTE pattern, in turn, is derived from an EIA
standard test pattern (RS-189-A). The image, is set
up to be generated by an 801GX as an encoded TV
output. It is designed for adjusting the color settings
of a television monitor by eye. It can also be used
with a TV waveform analyzer and vectorscope for
testing video signal processors and color decoders.
The image is available on all models as a component
RGB signal. Some of the image’s elements have some
differences from the original SMPTE specification.
These differences are given in descriptions of the
individual elements.
1) The upper 67% of the image consists of a series
of color bars. These bars match the order of
the bars in the SMPTE and EIA patterns. They
are similar to the 801GX’s TVBar_75 image
without the last black bar.
2) The left hand side of the lower 25% of the image
contains isolated -I and Q color difference
signals that match the original EIA and SMPTE
patterns. The -I signal appears as a bluish gray
bar and the Q signal appears as a purple bar
on a TV monitor. The bars are separated by a
white (+100 IRE) bar.
3) The right hand side of the lower 25% of the
image contains a narrow 12.5 IRE gray bar.
Due to a hardware limitation on the 801GX,
this portion of the pattern does not match the
original EIA and SMPTE patterns. The original
patterns had +3.5 (blacker than black) and +11.5
IRE bars separated by a +7.5 IRE (black) bar.
4) The remaining central 8% of the image contains
a row of chroma set bars. These bars are part
of the SMPTE pattern but are not in the EIA
pattern. The order of the alternating color and
black bars matches those in the SMPTE pattern.