There are several 'scientific' methods to determine contrast ratio (going by the basic definition of scientific), but there is not a universally accepted way to determine it...sometimes they use different methods.
Still, the statistic can be useful in comparing models from the same manufacturer, or as a general reference between manufacturers. Decent manufacturers can usually be expected to use more realistic tests (i.e. not modifying settings between the dark and light pixel tests).
So yes, contrast ratio shouldn't be taken as gospel, and it is used as a marketing tactic, but it is not only a marketing tactic. If you understand the types of testing that is done on them and know how different brands usually test, then it can be plenty useful.
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There are several 'scientific' methods to determine contrast ratio (going by the basic definition of scientific), but there is not a universally accepted way to determine it...sometimes they use different methods.
Still, the statistic can be useful in comparing models from the same manufacturer, or as a general reference between manufacturers. Decent manufacturers can usually be expected to use more realistic tests (i.e. not modifying settings between the dark and light pixel tests).
So yes, contrast ratio shouldn't be taken as gospel, and it is used as a marketing tactic, but it is not only a marketing tactic. If you understand the types of testing that is done on them and know how different brands usually test, then it can be plenty useful.