The HDR format Dolby Vision is designed to handle tone mapping ... uniform content such as video test patterns.

To do this, we measure across a range of 100 IRE (full white) test patterns in different sizes, with the two most important being 10% of the screen’s total area, which gives us an indication of the TV ...

Microsoft first announced this app back in February, saying that it was bringing the Xbox' HDR Game Calibration functionality to Windows. The Windows app offers three main test patterns.