why do they rate the #’s of black colors that a tv has?
everytime that i go look at lcd and plasma tvs, they never rate the amount of colors they always rate the number of shades of black. why is that. and how can you tell one shade of black from another shade of black
There are hundreds of different makes/models of televisions and people want to put ‘numbers’ to try and pick the unit with the best specs for their money.
But how do you put numbers to rate one TV vs another? They all look really really good in the store.
They have found that the better looking images have 2 things they can measure which show they are better than the cheaper televisions.
One of these is “black levels”, the other is “contrast ratio”
Look at a TV screen close up. See the little dots called “Pixels”?
It is really hard to make a TV screen where some of the pixels are totally dark. Usually every pixel is showing some light from the nearby pixels. The better/more expensive televisions do a better job of making pixels totlally black.
The other thing the better televisions have is that they can take 1 pixel and make it black, but the next pixel can be white. This is really hard to do. The numbers of how much light you get from one pixel and how dark the next is called the “contrast ratio”. The bigger the number the better. Decent TV’s are 3000:1 ratios.
HOWEVER
Cheap TV makers with low contrast ratio sets argue that TV is about moving pictures where the measurement should be taken while things are changing on the screen – not a fixed black/white lines. Then they find moviing pictures and claim they get 5,000:1 or 10,000: 1 ratios.
Because of this – you should ignore “Dynamic Ratio” numbers because everyone uses a test that makes their TV have better numbers.
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Tags: hdtv