Contrast Ratio in A Real Room
In marketing literature, contrast ratios for emissive (as opposed to reflective) displays are always measured under the optimum condition of a room in total darkness. In typical viewing situations the contrast ratio is significantly lower due to the reflection of light from the surface of the display, making it harder to distinguish between different devices with very high contrast ratios. How much the room light reduces the contrast ratio depends on the luminance of the display, as well as the amount of light reflecting off the display.
A clean print at a typical movie theater may have a contrast ratio of 500:1. Dynamic contrast ratio is usually measured at factory with two panels (one versus another) of the same model as each panel will have an inherent dark and light (hot) spot. Static is usually measured with the same screen showing half screen full bright vs half screen full dark. This usually results in a lower ratio as brightness will creep into the dark area of the screen thus giving a higher luminance.
Read more about this topic: Contrast Ratio
Famous quotes containing the words contrast, ratio, real and/or room:
“By contrast with history, evolution is an unconscious process. Another, and perhaps a better way of putting it would be to say that evolution is a natural process, history a human one.... Insofar as we treat man as a part of nature—for instance in a biological survey of evolution—we are precisely not treating him as a historical being. As a historically developing being, he is set over against nature, both as a knower and as a doer.”
—Owen Barfield (b. 1898)
“People are lucky and unlucky not according to what they get absolutely, but according to the ratio between what they get and what they have been led to expect.”
—Samuel Butler (1835–1902)
“Main Street was never the same. I read Gide and tried to
translate Proust. Now nothing is real except French wine.
For absurdity is reality, my loneliness unreal, my mind tired.
And I shall die an old Parisian.”
—Conrad Kent Rivers (1933–1968)
“Son, brother, father, lover, friend. There is room in the heart for all the affections, as there is room in heaven for all the stars.”
—Victor Hugo (1802–1885)