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What are you using to measure? A suitable lab instrument?
What you say isn't physically or mathematically possible.
You can ONLY get more contrast with a top (daylight filter) and increased internal display brightness (eink front light, lcd back light, CRT, plasma, OLED etc) and when there is daylight. Such a filter slightly reduces contrast in the dark and can reduce sharpness.
You can't remove the colour filter on eink or lcd non-destructively.
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