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post #1 of 7 (permalink) Old 03-18-2008, 01:11 PM Thread Starter
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Contrast ratio...discuss

I have always been a conspiracy theory person when it comes to contrast ratios of televisions and projectors. I have always thought there was a point in which the eye cannot see a difference between contrast ratios, and all these new crazy 25000:1 ratios were just bullshit. I knew all these ratios were measured by electronic devices to give us numbers.

Well after some research I found that our eye's capability of a static (non-changing) contrast ratio at a certain second is between 100:1 - 1000:1. This number seems to be debated, however our eyes can see what professionals are estimating 10,000,000:1 BUT it takes to long for our eyes to adjust. An example in the article link below is that it takes almost 30 minutes for our eyes to adjust to be able to see to its maximum potential at night, thus if a scene in a movie changes from a dark to light or light to dark scene quickly, it will take many seconds to minutes for our eyes to adjust the dynamic range of contrast ratio that we can see.

Moreover, contrast ratios go to shit if we dont have these displays in pitch dark rooms. The light of one candle (1 LUX) will eliminate our ability to see high contrast ratios. You wouldnt be able to tell the difference between a a 500:1 or a 10,000:1 because of the light. If you are in a well lit room, your ability to see over 50:1 disappears.

So... what are your thoughts? Id love to hear Kozmo's thoughts in particular just because he sells the stuff and Im 100% sure these high numbers are big bullshit selling tactics.

Article link: http://www.practical-home-theater-gu...ast-ratio.html

Basic contrast ratio stuff:
http://en.wikipedia.org/wiki/Contrast_ratio

The Eye:
http://en.wikipedia.org/wiki/Eye

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post #2 of 7 (permalink) Old 03-18-2008, 01:19 PM
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IMO, if it looks good who gives a fuck.

I spend a lot of time editing photos in Aperture and I'm a helluva lot more concerned with my rooms lighting being true than the contrast ratio of my monitor (2000:1 BTW)

Contrast ratios matter to a point because they enhance color. A lack of contrast makes colors look bland. But it is only as important as how much the eye can see. IMO contrast ratios matter a bit more as the screen gets larger but thats more due to how the back lighting works with the LCD panel. Contrast ratios are important but I'm more interested in the total package of a TV.

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post #3 of 7 (permalink) Old 03-18-2008, 10:28 PM Thread Starter
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not a very good discussion going on Where is Kozmo... our tv expert?

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post #4 of 7 (permalink) Old 03-19-2008, 06:36 AM
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Quote:
Originally Posted by 8mpg
not a very good discussion going on Where is Kozmo... our tv expert?
Our resident tv expert works at Best Buy? No offense against Kozmo, but uh...
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post #5 of 7 (permalink) Old 03-19-2008, 08:34 AM Thread Starter
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Quote:
Originally Posted by ClockwrkOrangeS4
Our resident tv expert works at Best Buy? No offense against Kozmo, but uh...
it was a joke... He seemed to be a plethora of knowledge in a couple other threads... I figured his intellect would overwhelm us on this.

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post #6 of 7 (permalink) Old 03-19-2008, 04:10 PM
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Quote:
Originally Posted by 8mpg
it was a joke... He seemed to be a plethora of knowledge in a couple other threads... I figured his intellect would overwhelm us on this.
I think he's just working part-time at Best Buy while going to school. Everyone has their own opinions on electronics, but Brandon knows his stuff.
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post #7 of 7 (permalink) Old 03-22-2008, 10:36 AM
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Quote:
Originally Posted by ClockwrkOrangeS4
Our resident tv expert works at Best Buy? No offense against Kozmo, but uh...

Thats why I'm not in here anymore.

Regardless...

Contrast ratio is supposed to basically be a measurement of how dark the black is, and how bright the white is with a black pixel, right next to a white one.

The higher the number the better.

Now HOWEVER, be aware of a few things.
1. There is no standard in the industry to measure this stuff. So sony's 5,000:1 could be Samsung's 3,000:1 for all we know.

2. Plus, most companies (mainly LCD yet we are starting to see plasma's do the same thing) seem to put their DYNAMIC contrast ratio. Now this is a whole other beast. Essentially this is supposed to be the television's max capability as far as contrast goes. However, this is given all the proper situations, or the most perfect
picture situation. (That would be highly unlikely to occur during normal viewing)

This is also sometimes not labeled as dynamic at some places though.

Knowing the base Contrast ratio's for certain technologies can help you figure this.
LCD is usually 500:1 to about 5,000:1 or so non-dynamic with dynamic @ as high as 500,000:1. So usually anything over 5,000:1 may be dynamic even if not labled as so.

PLASMA is usually 10,000:1 to about 15,000. You tend to not usually see Dynamic measurements from plasma, but with LCD's doing it so much, we are started to see it... The new 1080p 42 Panny boasts 1,000,000:1 dynamic, but I think its 15,000:1.

In my opinion, its just a made up stat for the most part. I see tons of people shopping tv's by just what the tag says. Just look at the tv and see for yourself how good the black and whites are. There has always been a clip in the demo feed at best buy that has snow in it. Look for Snow next to dirt, trees, dark water, or dark sky. Sometimes the snowy areas tend to cause those dark areas look gray in the areas close to white, instead of black.




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Last edited by KOZMO; 03-22-2008 at 10:53 AM.
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