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•By ockham
 at Oct 18, 11:23 AM about
 DO THE MATH
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 at Oct 17, 10:10 PM about
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DO THE MATH

What do you do with your desktop during the average day? Check email, surf the web, write reports and real work, post to your blog?

Yeah, me too. Trying to get away from that last thing...

But for the next couple of months, I'll also be working on the opening sequence for an IMAX film.

You've probably seen an IMAX film at your local science center or, increasingly these days, at your local mall. The screens for these things are huge, usually around 5 stories tall. Each frame of an IMAX film is several thousand pixels across, by several thousand pixels down (TV is 720 pixels across by 540 pixels down, maximum--by the time you get the broadcast signal at home it's down to around 400 lines or less for standard NTSC).

As you might imagine, to make a single frame of IMAX is several orders of magnitude more of a digit-crunch than making a single frame of standard TV. Standard TV frames, uncompressed, are around 1 meg apiece, so each second is 30 megs (1 meg x 30 frames per second), and an uncompressed minute is roughly 1.8 gigs. Most systems don't use uncompressed video, though, and today's DV camcorders don't even shoot uncompressed video. Digital video, the kind that can skip across a FireWire cable from your camcorder to your hard drive for editing, playback, whatever, is compressed 5:1. Good compression is your friend.

Well, I did a test render today. Each IMAX frame is 25 megs, compressed (67 megs uncompressed). Twenty-four of them play each second.

My sequence is currently 25 seconds long. Hmm....25 megs per frame x 24 frames per second x 25 seconds equals about 15 gigs.

Pardon my French, but @%$!

I mean, @%$ @%$! 15 gigs for 25 seconds of film! And in all likelihood, the sequence will get longer.

Thank God for FireWire hard drives.

Post to del.icio.us

Posted by B. Preston on October 17, 2003 1:03 PM
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Comments

Bryan - I’ve just got to tell you how much I love your blog. Seriously, I do. I read your blog more than I read Andrew Sullivan’s blog now (which is saying something, since I do admire Andrew Sullivan). You have a great sense of mixing your polemical political posts with some really first-rate, fine writing on other technical and apolitical topics. Always interesting and always engaging (your recent post on Terry Taylor was also one of these fabulous posts - and I’m not even a Christian Rock fan). How do you find the time to keep such a consistent blog going and do all the other stuff you do? It is very impressive, all around. In all seriousness and sincerity, a heartfelt congratulations and thanks!

Posted by Jimmy Huck on October 17, 2003 9:10 PM

Thanks, Jimmy. Sometimes this feels like a colossal waste of time to be perfectly honest. Day after day, argument after argument, with no end in sight. I have to occassionally mix in something else from the other parts of my life, just to keep from going mad. Besides, all war and no play…well, you know the rest. That stuff usually feels like I’m writing to an audience of one—me. I’m glad to know otherwise.

How do I find the time? I write fast and edit on the fly. The lame typing class I took in high school seems to have stuck with me.

Posted by Bryan on October 17, 2003 10:10 PM

I appreciate this form of shoptalk.… what I do for a (sort of) living is educational graphics on a much smaller scale. But the scale isn’t all that much smaller; even using 640 × 640, a 30-second animation is half a gig in uncompressed form. This is a good example of how advances in materials and manufacturing can matter more than inventions. Only 15 years ago, this sort of animation was unthinkable for one person using one computer; nothing new has been invented since then, but disk and memory size have made all the difference.

Posted by ockham on October 18, 2003 11:23 AM
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