the quality or state of being glary; harshness or brightness of light, or the quality of being obviously obtrusive.
From 'glary' (adjective) plus the noun-forming suffix '-ness.' 'Glary' derives from 'glare' (Old Norse 'glarra').
Photographers and cinematographers carefully manage 'glariness' because too much harsh light washes out colors and makes images look flat and unpleasant—but sometimes that's exactly the mood they want!
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