4k white level screen, monitor, tv test pattern for 10 hours.
Also make sure to check black levels: [ Ссылка ]

Calibrate contrast and do a white level test with this demo screen.
It can be used for any screen, monitor, tv, smart phone, iphone or laptop screen up to 4k.

► More Test Patterns: [ Ссылка ]
► Basic Monitor tests: [ Ссылка ]

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