Originally Posted by mark haflich
Man. i spend the dasy shopping with my wife and watching fotball and I come back and find 4 more pages of this thread. Wow.
I skipped through it, I just can't bear to read it all.On off is not affected by the room conditions
. That's a fact. darimp pubplished a complere paper on it. More is always good.
YANSI cR is affected by the room when measured on screen.. Measured looking at the light exiting the screen, I think it would eliminate room effects but that information does not reflect what one will get off the screen with room effects. you can have a high ANSI looking at the lens and have a much lower ANSI when mesuring off the screen and that number is the relevant one. The pattern more or less dividesinto black and white blocks, the sum of each about each being the same area. The blocks are big so that screen bleed is taken out of the equation. One measuring at the center of each block. The spead of blocks tend to average out projector brightness non uniformity and screen edges being closer to room boundaries and more affected by room reflections. .What does the off the screen result really mean. Much more in a black pit room but still not exactly sure.
A few years back I attacked Joe Kane, as a friend, in a group presentation, he has attacked me plenty in such settings also, because of his glib use of the word contrast. I asked him exactly what he meant by his use of the word? He looked at me and said he was misusing the word and basically he thought the audience was too stupid to undrstand what he was talking about if he use the correct term. I said try us.
He said what the correct term was, MTF and everytime he tried to use the word contrast from that point, he stopped himself and used the term MTF. MTF off the screen is the true measure of system contrast. The room, the screen and the projector. MTF is more or less the degree a system resolves contrast. You can meassure MTF of the lens alone, the projector including the lens, then that with the screen and the room.
Of course, you comprising the dumb audience would have no basis to translate a particular MTF number to what you would see.
i am going to bed. Hope to see 16 more pages of responses in the morning.
"room conditions" ( like light in the room ? dos that qualify as room conditions ? ) if it do and you are saying that light in the room do not change on/off CR ( sorry MTF
a Quote from a man
When asked what I see, I use there is a much higher degree of realism with the Sony 1000ES but some of this is dependent on the screen material. In my case Snowmat in a dark pit room, the only type of room where the full benefits of snowmat can be seen. In any other room, the wide dispersion of the material will result in room boundaries reflecting light back on the screen wiping out part of the system MTF
Well - "part off the system MTF is that only
the ANSI CR and NOT on/off CR ? saying that, if you trow a all black 0 ire frame on the screen, the black level will not go up because of the reflecting light or a extern light source !!?? ( or the 100 ire white will change by the same amount and preserve the same on/off CR no matter, how much external light is hitting the screen ? )
Remember we talk about what is seen on screen ( the hole part off a systems MTF / CR ) and if light from the room ( because off a light source, white walls etc. ) do not change on/off !? why should we then have batcaves and turn the light off ? because it make the ANSI CR bad ? but Coderguy is saying that ANSI CR do not means anything ( dosnt matter if the ANSI CR is 100 or 400 on screen or even in the proejctor !! ) , so now Im Confused
Im sure, thats not what you are saying Mark ( but it sure reads like that in your text ) ? or if it is, then my room is behaving strange
( and I need new eyes too
Or said otherwise: what do you mean ?
Hope you did get a good night off sleep - tonight it is a new year
Happy new year everbody