8
P09
Gradual pattern
Gradual transition of colors.
P09: Red
P10: Green
P11: Blue
P12: Gray
P10
P11
P12
Application
This pattern is for brightness control and luminance writing current. And this
can overall the color performance, amplitude response/resolution and
linearity of chroma amplitude.
P13
Color Bar
Comprises 8 vertical bars- White, Yellow, Cyan,
Green, Magenta, Red, Blue and Black
Application
The white bar, to adjust the amplitude of the color difference signals with
respect to the luminance signal on the picture tube. The blue and green
guns can be switched off to allow the amplitude of the R-Y signal to be ad-
justed. This is done by ensuring that no difference in brightness is observed
between vertical bars five and six of the color bar and the horizontal refer-
ence bar. In a similar fashion, the amplitude of the B-Y demodulator can
be determined.
P14
Grayscale
Full screen linear staircase signal with 8/16/32/64
identical steps from black to white
P14: 8 steps
P15: 16 steps
P16: 32 steps
P17: 64 steps
P15
P16
P17
Application
This is used to locate faulty linearity of the video amplifier or greyscale set-
ting. Nonlinearities mainly result in a compression of the white level.
GRAD
GRAD
GRAD
GRAD
