Ten Thousand Photos In Nine Minutes

[larry cottrill]

A YouTube find - interesting if you can stand to watch it - street scenes, people, wineries & vineyards, restaurants, art, people, dog, cat, etc.:

http://www.youtube.com/watch?v=n3FdlxMiZHM

L Cottrill

[heada]

Thats 540 seconds (assuming all 9 minutes is used to show the photos) to show 10,000 photos....meaning 18.5 photos per second...or about 1 photo per 2 frames of video (assuming 30 frames per second, which is about normal broadcast frame rate in the US) Most people have problems with lights that flicker at less than 25 Hz so I can imagine a video of images where the images that change every 2 frames would drive most people insane (or give them a headache)

It would be interesting to see how many people can actually identify more than 10% of the photos that were displayed.

-Aaron

[larry cottrill]

Well, of course, I can't independently verify that there were really 10,000 pictures ... after a couple of seconds, I stopped counting ;-)

Actually, it's amazing how many of the images I remember "in essence" - that is, not really a photographic memory but a mental image that remains. It's funny how little time it takes to make an impression - even if it's replaced a split second later by the next image. Some of it depends, I think, on what images strike you as naturally interesting - sort of your innate "artist's eye" for a subject or theme.

L Cottrill

[Mike Everman]

Off this topic, but I find it interesting that the light shining through movie film flashes twice per frame. Neat way to reduce flicker.

[hagent]

Wow. You can't blink or this movie just doesn't make any sense.

Must have had a bad sex life.... lol "Honey stop taking pictures and come to bed!"

[larry cottrill]

Off this topic, but I find it interesting that the light shining through movie film flashes twice per frame. Neat way to reduce flicker.

Actually, on a professional projector it's often three or five exposures per frame. In the early days (one shot of light per frame), movies were commonly dubbed 'flicker pictures', which became shortened to 'flicks'. Now you know.

Perception of flicker is highly subjective, and varies a lot with the nature of the scene. When I first saw Kubrick's 2001: A Space Odyssey on the big screen in 1968, I was bothered by the noticeable flicker of all the scenes that were basically long shots of objects in space - in other words, scenes that were mostly black with small areas of bright white. It's the only time I've ever noticed flicker in a big screen projection setting.

On all projectors that I've ever seen (which is not that many), this is produced by pie-slice-shaped openings in a spinning metal disk just behind the film gate that revolves once per frame. This is how it was in the European Super-8 projector I used to use. That turned out to be a handy feature: When I needed a one-pulse-per-frame sync signal for my Super 8 Sound(TM) recorder, I just glued a small magnet to the disk and rigged a magnetic reed switch where the magnet would pass close by - voila! A perfect sync signal at whatever speed the projector chose to run at any particular moment.

L Cottrill

[Mike Everman]

I just glued a small magnet to the disk and rigged a magnetic reed switch where the magnet would pass close by - voila! A perfect sync signal at whatever speed the projector chose to run at any particular moment.

L Cottrill

Nice. I once converted a Christie movie projector to run up to 60 fps at either 4, 3 or 2 perf frames.
http://en.wikipedia.org/wiki/Maxivision

You should have seen the demo film we made, 48 fps 3-perf. We did the same scene in 4 perf 24 fps, then the projector would automatically switch to 48x3 and the detail and motion were stunning.

My friend Dean Goodhill couldn't get this off the ground, and it looks as if digital projection will make it a moot point.

Cool stuff. I was hoping he'd get that business going, because I was hoping to design a projector from the ground up using a new type of transport I developed. Alas...