DVDO AVLab TPG Guía de usuario descargar pdf (Pagina 28)

DVDO AVLab TPG - 4K Test Pattern Generator

DVDO AVLab TPG 28 A.04

Adjust Chroma/Color/Saturation control so the outer bars (and small bar

under it “A” ) blend into each other, then adjust Tint/Hue so that the inner

bars “B” blend into each other. When the Saturation and Hue are adjusted

correctly, the white bar and the blue bar should be exactly the same shade

when looking through the blue filter. Saturation and hue settings interact

with each other so after making this setting you may want to go back and

check that the saturation setting is correct.

Grey Ramp

The ‘Gray Ramp’ can help verify that your display is showing the

gradients between black and white correctly. You should see a

smooth transition between black and white with this test pattern.

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

A B B A

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DVDO AVLab TPG Guía de usuario Pagina 28