Real 4K HDR Test Pattern Brightness stress test Chromecast Ultra

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=NlAsAuBtmps

This test pattern tests the maximum brightness of your display. This test pattern can only be viewed correctly using a 4K HDR TV that supports YouTube HDR. Such devices include 4K HDR TVs connected to a Chromecast Ultra or some Samsung TVs with updated firmware. If you are viewing this video on an SDR (normal non-HDR TV) this test video will not be displayed correctly. • Buy a Chromecast Ultra for your 4K HDR TV: https://bhpho.to/2ry54y5 • The test was designed to ramp up the brightness of a window of white pixels. Both the brightness and the size of the window increase throughout the test video. Except a single color grading studio monitor no other display available today can pass this test when the brightness reaches the highest levels OR when the window size takes over the majority of the screen. • The test pattern will display a white box that increases in size from 4%, 9%, 25%, 49%, up to 100% of the screen. Each time a new size box is shown the brightness of the box increases from 100, 400, 1000, 2000, up to 4000 nits. Each combination of window size and brightness will stay on the screen for 5 seconds. • Here is how to tell when your display starts failing the test. Every 5 seconds the brightness of the window increases and stays at that brightness for the entire 5 seconds. Displays fail the test in two ways: • Failure #1: At some point you will notice that when transitioning to a new brightness that the screen does not get much brighter than last time, or does not change brightness at all. This means the panel has reached maximum brightness and cannot go further. • Failure #2: At some point (especially when the window sizes are bigger) you will see that when transitioning to a new brightness the screen momentarily gets brighter and then it drops down in brightness within less than a second. This happen if your TV has an Automatic Brightness Limiter (ABL), which restricts the maximum brightness in certain situations to either save on electricity cost or to protect the panel. You can read more about ABL online or visit a forum such as: http://www.avsforum.com/forum/40-oled... • TVs handle brightness clipping in different ways. It is possible you will see transitions between brightness ranges that your TV should not be capable of. Trust your eyes to see if the difference in nits between transitions is actually as large as expected or not.

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