Manual of AVSHD 709 Disc Calibration Patterns -1-Black Clipping :

Friday 16 March, 2018 |

Manual of AVSHD 709 Disc Calibration Patterns -1-Black Clipping

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This is a very low APL pattern for observing black-level on a digital display. Most often black-level will be labeled brightness. When setting the control, the basic idea is to go as dark as possible without losing detail. A setting that is too high unnecessarily raises the brightness of black and will wash out the image, and an overly low setting will cause a loss of detail. Ideally you want dark blacks with all available detail, which is generally indicated by 17 and above flashing on this pattern.

To get an idea how the pattern works, begin by setting black-level very high. With black-level set high you should see how the pattern contains a number of vertical bars flashing over a dark background. When turning down black-level the lower numbered bars will begin to disappear into the background. To get the darkest black possible, without losing information, you want to turn down black- level to the lowest setting where 17 remains flashing. Being close to the display in a room without lighting may help you notice the darkest bar that remains flashing. Displays that include backlight or iris controls may be easier to spot the darkest flashing bar when using increased backlight or iris settings. If your display is able to show the numbered 2-16 bars, ideally when you are done those bars from 16 down will blend together, so you can only see 17-25 flash. On a digital display, use this pattern to set black-level as dark as possible while 17 flashes.

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