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This topic comprises 2 pages: 1 2
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Author
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Topic: Need resolution numbers for publicty copy
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John Hawkinson
Film God
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Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 09-21-2007 11:18 PM
The problem, Frank, is that you fundamentally cannot express the nature of film in a resolution number. This is because the grains on film are of nonuniform size, and so instead you use something called the modulation transfer curve to discuss quality and information density.
Of course you can say that film has an "equivalent" resolution, but there are many people with many fights about what this means. And the apparent quality is a function of the generational losses, the grain size and quality of the original camera negative and all the intermediate elements, even the lighting and ASA speed, etc. Even the nature of your projector (how long is the intermittant pulldown cycle? Do you have a "drive-in" intermittant, a "quickermittant," an electronic intermittant, a three-blade shutter, etc., etc.?).
Various people have cogently argued that film is equivalent to 2k resolution, as well as 4k resolution, as well as higher numbers. Note that when we say "2k" we mean "2k pixels per line," i.e. a horizontal resolution of 2048 pixels across, with the appropriate number vertically for the format in question, i.e. 2048x1107 for 1.85:1.
Also, when you are assessing video quality, there is a lot more information to talk about than just resolution. This is not my area so I'll let someone else summarize.
--jhawk
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Cameron Glendinning
Jedi Master Film Handler
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Posts: 845
From: West Ryde, Sydney, NSW Australia
Registered: Dec 2005
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posted 09-23-2007 07:45 AM
I have been told a film grain can be as small as 5 microns, so ball park, best possible would be around 3,300 lines for a 35mm full frame.
Other factors can then degrade the image, the lab, projector steadiness, lens cleanliness and quality ect. Obviously if the film frame is a laser scan, its quality is governed by its 2k or 4k resolution.
On a 4k digital camera with a super 35mm sized gate, the image sensors are i believe aprox 5 microns a piece.
quote: John Walsh to the layman, how much better the average print is compared to the average digital projection?
Digital is rock solid steady! that's really the only layman difference
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Frank Angel
Film God
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Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 09-23-2007 01:18 PM
Well, it looks like I might leave be better off just dropping that High Def angle and just hype the fact that Farley Granger is going to speak after the first first show. Now THERE'S something they can't get off the DVD (ooops, forgot about those pesky "special features"....dang!). Welp, I guess I'll have to go with the "communal experience" thing....but then again, I am no fan of sitting around with strangers and their cell phones and bad manners. Hmmm.....this is getting to be quite a quandry.
And thanks Mark for the confidence in our operations, but in fact, we don't have Kinotons and we've got 10 yr old ISCOs, so maybe not the lastest of the computer designed in that department. Giant screen. That's it. "See it on the Giant Screen." But on the other hand, if they've got a good sized LCD or Plasma flat in their living room, relatively speaking, their field of vision will be the same as if they were sitting in my cavernous theatre, maybe their's will seem even bigger.
Damn, I am getting depressed.
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