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TV calibrator anyone? gamma changes with backlight

dasdoing

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May 20, 2020
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So I use this to calibrate my TV: http://www.lagom.nl/lcd-test/
plus this for helping with gamma, since it is easier to see https://www.calibrize.com/

the only option I have in PC/HDR mode is bt.1886, so I adjust it to make green gamma perfect, because this way blue needs an increase and and red an decrease, which I than do in software (OS). this way I can make gamma "perfect" for the the 3 colours. Now, the problem is that, if I adujst it during day, it is wrong at night (because of less backlight) and vice versa. To my understanding backlight should not effect gamma settings. what is happening?
 
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