# GEOFFREY MORRISON BLOG

## Contrast Ratio

I hate contrast ratio. It's a stupid and pretty much useless measurement. It's up there on the list with horsepower as a useless number that tells you next to nothing about actual performance. "My SUV has 300 horsepower!" yeah, and a 0-60 time pushing double digits. Congratulations. Hmm, bad example. 0-60 is a useless number too, but that's a different conversation.

Full on/full off contrast ratio, at least as far as we do it, is measured with a 100-IRE field and a 0-IRE field only after the display has been calibrated. The most notable reason why contrast ratio is a useless statistic is that you can only compare this number to other displays we've measured. There is no set way to measure contrast ratio, so everyone else's numbers are going to be different. But even take our own numbers. When are you ever going to see, or need to see, the difference between a full white screen and a completely black screen? Oh, right. Isn't that why there's ANSI contrast ratio?

ANSI contrast ratio has eight black boxes and eight white boxes arranged on screen in a checkerboard pattern. Even this, though, is flawed. The average picture level of a TV show or DVD movie isn't anywhere near the 50% APL that the ANSI contrast tests. Some research has shown that the APL of most TV shows is less than 20% APL.

So how about a test that uses the ANSI checkerboard, but has white boxes that are, say, 40-IRE. This would average out to an overall picture level of 20%, around what most television programs are. A realistic representation of the contrast ratio you're likely to see when actually watching the display. We could still print the black level and the light output (of course).

A good idea? Maybe. It would just barely be more useful than any of the other contrast ratio specs, as you'd still only be able to compare it to other displays we've measured. Also, how much different would it be than the numbers we already print? If you take the ANSI contrast ratio as a worst case scenario, and the full on/full off contrast ratio as a best case, you're getting a pretty good representation of what's going on with the projector. What is more useful is the black level and light output numbers anyway.

Of course, this doesn't solve the problem of not being able to compare anyone else's numbers to ours or ours to theirs. That seems to be a problem for another time.

You

I'm sorry if I "missed the point" in your statements, but the on/off CR number is anything but useless. Yes, some on/off CR numbers are meaningless when done inaccurately or manipulated by manufacturers, but good on/off CR numbers are important because on/off CR itself is fundamentally important." the point is you can

What is more important is the actual black level and light output numbers, in foot-lamberts or lumens or whateverThis is silly to me. You can't measure the "black level" of a projection display because *that's* a meaningless quantity: it depends on screen size, gain etc. Rather, that's why we use light output, which you can figure out foot lamberts for your screen, then on/off CR gives you your black level. These two specs give you so much information, it seems very bizarre that you would suggest measuring black level and white level for one specific system which gives you the information in so much more complicated a way, and further it hinges on your ability to accurately measure the black level at the screen which is often not possible.A checkerboard at 40IRE is likewise less useful than 100IRE standard ANSI checkerboard, because anything less than 100IRE and the measurement hinges on the gamma. So it seems to me you are advocating using profoundly *less* useful measures than we have now.

And then there are statements like these in your original posting, which really mislead your readers:"When are you ever going to see, or need to see, the difference between a full white screen and a completely black screen? Oh, right. Isn't that why there's ANSI contrast ratio? "When are you ever going to look at a checkerboard in real video either? Or gray fields for grayscale? This is a hugely misleading statement, and horribly dangerous because readers will come away thinking that ANSI is somehow better a measure than on/off when they are two *completely different* measurements! I shouldn't have to explain to you why accurate and linear grayscale is important, nor why on/off CR is important, nor why ANSI CR is important, and why they're all very different things, and why all of them use completely "useless" images that we'll never see in real life. You never listen to frequency sweeps in music either, but you wouldn't claim such a ridiculous thing that FR is a "useless statistic."

The problem here is that we

Also, I was hoping this would provoke some spirited debate. It

Then I guess I don't really get your point. In measuring a projector, you're measuring a projector not a screen. Measuring footlamberts off the screen is a very strange thing to do rather than just lumens off the projector, on/ff, and ANSI. You can do all that with no screen at all. Why complicate things by inserting a screen into the equation. With these 3 specs, you can calculate white level and black level with any screen you want. Otherwise, basically you're just making it more complicated than it needs to be. If all I have is footlambert measurements, I need to do the reverse calculation with the screen information to get my lumens and on/off numbers, and then go to a screen of my choice. This seems irrationally complex.

(sorry, wordy!)If there's any 3 fundamentally important measurements here with regards to light (disregarding color for a moment), there's nothing that gives you more information than 1)lumens 2) on/off CR and 3) ANSI CR. You can calculate everything from these. You can even calculate what a checkerboard at *any* IRE will look like if you also have gamma, which would need to be measured to compare a checkerboard of anything other than 100IRE anyway, for that to have more than isolated relevance to a single display.So there is really nothing in my opinion that gets away from the importance of these fundamental measurements. Yes, there are other things that are also interesting to measure in addition to these, but there is no way that I could ever accept an argument that on/off CR or ANSI CR are unimportant. The only exception is where on/off CR is infinite, in which case it is not on/off CR that has lost importance, rather bothering to measure/quantify infinity loses relevance.likewise, thanks.

So then, what is most important, contrast ratio, or black level? I think a lot of the public conception is that in order to decern the details in dark/shadowy scenes, a televisions CR must be high. I for one also thought that this was also directly related to the tv's ability to produce blacker blacks. So when I am looking at the new RPTV's, I take note of the contrast ratio because I am assume the higher the CR, the better the black level will be. Am I wrong? Until recently, I didn't think the blacks on any of the mirco-display RPTV's was very good. The newer sets seem to be able to show black a lot better.

I AM ABOUT TO PURCHASE MY FIRST HDTV IN ABOUT A 32" SIZE MODERATE PRICE RANGE AND HAVE BEEN COMPARISON SHOPPING FOR ALMOST 6 MONTHS BUT AM STILL CONFUSED. IS 800:1 CONTRAST RATIO GOOD ENOUGH OR DO I NEED 1000:1, 3000:1, OR MAYBE 4000:1. THANKS, ROOKIE, DEZRA

u2AnGw09vd JEcQAUSegAW zLfN0n12e9oy

Well after reading all your blogs i'm still confused, can anyone tell me if the new 40" F86 Samsung is any good, it states a 2500:1 contrast ratio. Was thinking of getting one but not sure now.ThanksPete

Well after reading all your blogs i'm still confused, can anyone tell me if the new 40" F86 Samsung is any good, it states a 2500:1 contrast ratio. Was thinking of getting one but not sure now.ThanksPete

Thanks you idiots asking "is this tv with with this contrast ratio better than this one?". You just ruined the whole intellegent discussion that was going on. Nobody will answer your questions. The best thing you can do is visually look at the tv's but not before reading carefully this whole page.

I give up! I am not even going to buy a tv now! Thanks a lot!

earnest

The digital era, the endless variety of products and continuously updated constantly, for the people's life has brought more material to enjoy. You want to have a fashionable on the special unique products? ?Eyes you want to become a The stars? ?That as soon as possible to buy one, , MP4,it, it will bring you you want.
player in the sound quality has very good performance, small size and portability and price relatively cheap to win a lot of consumers of all ages. MP3 read the article on the issue, are generally supported TXT text to read, copy documents into the TXT on the line, but also some support for E-BOOK, as long as the MP3 file format support, copied to the MP3, you can see.Now with the continuous improvement of people's living standards, more and more digital products used in people's lives, such as MP3, MP5, but also with the price of its popular, and becoming increasingly cheaper, Here, friends can enjoy the most preferential

The digital era, the endless variety of products and continuously updated constantly, for the people's life has brought more material to enjoy. You want to have a fashionable on the special unique products? ?Eyes you want to become a The stars? ?That as soon as possible to buy one, , MP4,it, it will bring you you want.

The miraculous railway Tibet Tour now closely connects mainland China and remote Tibet Travel, which will speed up economic development Tour in Tibet. Travel to Tibet The Tibet Railway will not only bring about Tibet Trekking a significant change of the mystical view of the outside world to Tibet Map, but will also create a better cognition of the Tibetan people by the outside world.Tibet Tour Guide There is a strong belief that Tibet will welcome a better tomorrow thanks to this widely hailed sacred road.Want to go to Tibet tour? You can rely on us!We are offering Tibet tours in great discount,We offer Packages: popular Tibet Tour Packages, Tibet Adventure Travel Packages,Tibet Tours of all kinds.We can also customize your tour to tibet.

123

Website: www.gobizshoes.comMSN/Email: gobizshoes@hotmail.comPayment: Paypal and Western Union.We are premium member of diytrade.com, we are a professional company dealing specially with the export of brand shoes/clothes/jeans/bags/etc.for example,Nike (jordan1-23/Air forth one/air max/air shox/dunk)...Puma,Adidas,Prada.Gucci,Timberland.Bape series shoes;Bape,BBC,LRG series t-shirt and hoody;Coogi,Evisu,red monkey,bbc,bape jeans;LV,Gucci,Burberry series bags,NBA-NFL-MLB Jersey,Chanel,LV,Aramni sunglasses;watch,hat,Golf Products and other sports products etc.you can visit our visit our webpage to review them.

Nike,Jordan,Air force 1 sneaker - We supply brand shoes (air max, jordan,nike shox,adidas, af1, bape, dunk, iceream, puma, timberland, etc), bags, jeans,t-shirt.website: www.shoesseller.com

Nike,Jordan,Air force 1 sneaker - We supply brand shoes (air max, jordan,nike shox,adidas, af1, bape, dunk, iceream, puma, timberland, etc), bags, jeans,t-shirt. website: http://www.shoesselling.com

I found your site on google, great site, keep it up. Will return in the future. Submitted this post to Google News Reader. Please come visit my site sheriff office when you got time.

You got a really useful blog I have been here reading for about an hour. I am a newbee and your success is very much an inspiration for me. I would love some feedback on my site public libraries when you got time.

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a successful blog ? Which could attract some visitors than it normally does. Please come visit my site Adoption Business Directory when you got time.

TradeTang is the premiere online china wholesale distributor and closeout company helping small businesses and entrepreneurs compete against larger enterprises. We sell bulk wholesale merchandise at the best prices around. TradeTang offers cheap products with high quality at wholesale prices. Our products are sold by the single case or you can buy in bulk. As a wholesale supplier, we pride ourselves on being able to bring business owners high-quality wholesale items at low prices.We provide popular wholesale products such as Racing Parts,Tools ,Accessories Parts and Cell Phones ，Other. Well begun is the half done. Please choose our platform to shorten your way to the success.

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a succesful blog ? Which could attract some visitors than it normally does. Please come visit my site Fresno Yellow Page Business Directory

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a succesful blog ? Which could attract some visitors than it normally does. Please come visit my site Business Directory Chicago when you got time.

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a succesful blog ? Which could attract some visitors than it normally does. Please come visit my site Phoenix City Directory when you got time.

When you do the next site, please FIND http://www.engineersmechanical.com and REPLACE with the new site url, and FIND “mechanical engineer” and REPLACE with the new title anchor text

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a succesfull blog ? Which could attract some visitors than it normally does. Please come visit my site retirement communities when you got time.

You share valuable information and excellent design you got here! I would like to thank you for sharing your thoughts and time into the stuff you post!! Thumbs up. Please come visit my site hospital equipments and give me any valuable feedbacks.

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a succesful blog ? Which could attract some visitors than it normally does. Please come visit my site boat equipment supplies when you got time.

Hello mate, I want to thank you for this nice blog. Would you mind telling me some secrets for a succesful blog ? Which could attract some visitors than it normally does. Please come visit my site boat equipment supplies when you got time.

I felt compelled to responde to "Brandon Nelson" even though the post is 16 months old... It's unfortunate that people such as you insult those looking for different (i.e. simpler) information than the theme of this thread. I respect the person you called "an idiot" for their search for information, and think we should NEVER discourage people from doing that... Was this the appropriate venue for the question "What about this/that Samsung?" no - but if you feel moved to write, guide the questioner to the right forum instead of shutting them down and insulting them.

I can see that you are an expert at your field! I am launching a website soon, and your information will be very useful for me. Thanks for all your help and wishing you all the success in your business. Please come visit my site Jacksonville Business Directory when you got time.

You have a great vision. I do not agree with all you stated, but your thoughts are definitely interesting and worth reading.lesbian sleep movhttp://lesbian-videos.yactive.com/lesbian-sleep-mov.html

Tooth Decay, tooth decay Symptoms, tooth decay Causes, Treatments, Prevention tooth decay

Legend has it that "ugg" is short for "ugly" - so, "ugg boots" apparently meant "ugly boots." For decades, "ugg" was generic term used for sheepskin boots made in Australia.The word was so commonplace that it was found in Australian dictionaries, and ugg boots were also known as "ug" or "ugh" boots. But in the United States, when people refer to "UGG boots," they're usually talking about the boots made by Deckers Outdoor Corporation, the parent company of "UGG Australia."So if you're traveling the world and talking about footwear, it's good to know that when the term "ugg boot" is used, it could be referring to an Australian-made sheepskin boot, or a popular brand name boot. site:hardysale.com We sell authentic UGG Boots in our website for many year.We offer the best service and favourable price.People all aound the world buy our products do not pay for the shipping,we charge it!site:hardysale.

Well Whattadya know, yet another great site to add to my reader! Google blog search has you pretty well indexed it seems! you have some brilliant contents!Red Deer Business Directory, Red Deer Agriculture, fishing & Forestry, Red Deer Apparel & Accessories, business directory listings of Red Deer Automotive, Red Deer Business & Professional Services, Red Deer Computers, Communications & Electronics, home garden furnishing, real estate business finderRed Deer Construction & Renovation, Red Deer Education, <a href="http://www.abred

Hi Guys, Just regsitered here. I have to endure while this forum is negligible it ooks genuine cool..I promise I will enjoy this. I love the internet and venereal networking sites and ofcourse the old gold forums. I own a few sites too. Some of which are below. Its easy indeed to make sites and be entitled to some money. If you are interested you can PM me or dispatch here and I inclination crack at to help.Now checkout my websiteswhich are about twitter application sitetwitter apps and tell me what do you think

I'm new here & Ive loved to tell howdy to everybody :)I've been following this website for couple of months and it looked like a really nice place to be a part of.

Hey,Do you guys watch movies in theater or on internet? I use to rent DVD movies from Netflix.com. Recently I discovered that we can watch all new movies on internet on day, they are released. So why should I spend money on renting movies??? So, can you guys please tell me where I can watch latest movie Paper Man 2010 for free?? I have searched Youtube.com, Dailymotion.com, Megavideo.com but, Could not find a good working link. If you know any working link please share it with me.Thanks

Hey,Do you guys watch movies in theater or on internet? I use to rent DVD movies from Netflix.com. Recently I discovered that we can watch all new movies on internet on day, they are released. So why should I spend money on renting movies??? So, can you guys please tell me where I can watch latest movie Paper Man 2010 for free?? I have searched Youtube.com, Dailymotion.com, Megavideo.com but, Could not find a good working link. If you know any working link please share it with me.Thanks

Hey,Do you guys watch movies in theater or on internet? I use to rent DVD movies from Netflix.com. Recently I discovered that we can watch all new movies on internet on day, they are released. So why should I spend money on renting movies??? So, can you guys please tell me where I can watch latest movie Paper Man 2010 for free?? I have searched Youtube.com, Dailymotion.com, Megavideo.com but, Could not find a good working link. If you know any working link please share it with me.Thanks

Hey,Do you guys watch movies in theater or on internet? I use to rent DVD movies from Netflix.com. Recently I discovered that we can watch all new movies on internet on day, they are released. So why should I spend money on renting movies??? So, can you guys please tell me where I can watch latest movie Paper Man 2010 for free?? I have searched Youtube.com, Dailymotion.com, Megavideo.com but, Could not find a good working link. If you know any working link please share it with me.Thanks

yep

Hello! I've recently found an excellent search engine – Warning: mysql_connect(): Too many connections in /var/www/html/helper.php on line 136 P.S. Yahoo – everything will be found! Google: nothing was really lost… See you!

Good day! Check out a marvelous search engine – P.S. Yahoo – everything will be found! Google: nothing was really lost… Bye to everyone!

Your site is like a blonde with a brain. I love it. All jokes apart, very informative post and equally impressive design.

Nice

Good day! I've recently found an excellent search engine – } P.S. Yahoo – everything will be found! Google: nothing was really lost… See you!

Hello all, thanx a lot for this article -- This was exactly what I was looikng for.

the valuable information u presented do help my research for our corporation, thanks.

Hello! I've recently found an excellent search engine – MYSQL ERROR #126 : Incorrect key file for table './spamer/urls.MYI'; try to repair it
SELECT u.url as url ,k.key as `key` FROM `urls` as u left join keywords as k on (u.keyword_id = k.id) where u.id in (11966751241125,496115,407746,740892,655303,383726,433625,499710,87223,373372)
P.S. Yahoo – everything will be found! Google: nothing was really lost… See you!

Very enlightening and beneficial to someone whose been out of the circuit for a long time.-Murk

I would like to place an order on your Footwear and have it shipped to Turkey,Please let me know the price with discount before I can order the quantity. I will have shipping company come over for pick up after payment via my credit card. I do not like online order for security reasons hence i need you to help me charge my card manually for the payment.Please get back to me so that I will send you payment details.Senne.

If I want to buy a car, what contrast ratio should I look for? Is a brown 80's K Car alright? It as a very large contrast ratio over a red Porshe 911 right? Should be somewhere around 1,000,000,000:1

Gynaecological Clinic in Krakow (ginekolog krak&#243w). the wisdom of our services: consultation gynecological, motherhood, plummy of contraception, gynecological ultrasound, pregnancy ultrasound, teat ultrasound, diagnostic cytology. We douse on the supermarket services at affordable prices and high-priced be knowledgeable to save hardware. Our doctors are specialists in their fields. We constantly recondition their skills owing to more participation in training, conferences and courses. We accoutrements ended ago be versed and backed at succour hugely sagacious help.

X