DVDO AVLab TPG - 4K Test Pattern Generator
DVDO AVLab TPG
29
A.04
This test pattern is a horizontal gray ramp. There is a black level (0 IRE) vertical bar along the left of the
pattern and a white level (100 IRE) vertical bar along the right side of the pattern. Between the two bars
is a monotonic gray ramp which ranges from the minimum luminence level (i.e., blacker than black) at the
left to the maximum luminence level (i.e., whiter than white) at the right. The minimum level of the ramp
is a 10-bit digital value of 4 (equivalent to an 8-bit value of 1); the maximum level of the ramp is a 10-bit
value of 1020 (equivalent to an 8-bit value of 254).
If AVLab is set to 8 bit color depth, and you are using YUV video, that means there are actually only 222
(238-16) luminance steps being sent to the display. The display then interpolates and smooths these
steps to attempte to display something smooth across the screen. How much banding appears on the grey
ramp gives an indication as to the video processing capabilities of your display. If the banding is
noticeable, then either using deep color (10 or 12 bits) assuming your source and content is compatible or
adding a high quality video processor like the DVDO iScan Duo is an excellent solution.
Solid colors
These patterns are normally used with a color meter and software to read specific color levels. IRE stands
for International Radio Engineers and it is a relative scale, NOT an absolute. It defines the volt peak
to peak video divided up into 140 IRE units. This is done to make numbers for luminance levels easier to
communicate. In the ISF Training Manual, it is described as the amplitude of the video signal from
blanking (zero volts) to peak white is 0.714286 volts or 100 IRE units. Synchronization signals extend
from blanking to -0.285714 volts or -40 IRE units.
XHatch (coarse, fine, and focus):
To get the best picture from your CRT-based display or projector, you will want to make sure that the red,
blue and green signals are converged properly. To assist in converging these three signals we have
included two test patterns. In addition to convergence, you will also want to make sure that the focus is
Summary of Contents for AVLab TPG
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