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Author Topic: Long Exposure Pictures from Video  (Read 10317 times)

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Offline ruler501

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Re: Long Exposure Pictures from Video
« Reply #15 on: May 16, 2011, 06:44:11 pm »
It looks like a random blob... with what might be a face like thing in the middle
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Re: Long Exposure Pictures from Video
« Reply #16 on: May 16, 2011, 06:47:12 pm »
Quote from: DJ_O on May 16, 2011, 06:42:42 pm
Yeah I just converted the rickroll video :P
I love how it played the sound while it converted. XD
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Offline ruler501

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Re: Long Exposure Pictures from Video
« Reply #17 on: May 16, 2011, 06:48:57 pm »
I wouldn't mind too much. That rickroll song grows on you after a while
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Offline DrDnar

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Re: Long Exposure Pictures from Video
« Reply #18 on: May 16, 2011, 06:50:54 pm »
Quote from: thepenguin77 on May 16, 2011, 06:35:42 pm
I think this might be similar to what modern digital cameras do.
Wrong. DSLRs simply leave the sensor active for the duration of the exposure. (Each photon deposits a small amount of charge into the photosite. As the exposure progresses, the charge builds up. At the end, an ADC reads out the charge level.) The main difference between a digital long exposure and film long exposure is film suffers from problems like reciprocity failure and color shifts, whereas digital sensors suffer from noise issues, even at low ISOs.
Quote from: thepenguin77 on May 16, 2011, 06:35:42 pm
If I had just summed rather than averaged, all the pictures would turn out white.
That's probably because your camera is trying very hard not to make each frame pure black, so it's pumping up the ISO. With manual control, you could fix that.
« Last Edit: May 16, 2011, 06:51:54 pm by DrDnar »
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Offline ztrumpet

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Re: Long Exposure Pictures from Video
« Reply #19 on: May 16, 2011, 06:52:20 pm »
Quote from: ruler501 on May 16, 2011, 06:48:57 pm
I wouldn't mind too much. That rickroll song grows on you after a while
And this is why it's in my iTunes. :P
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Offline ruler501

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Re: Long Exposure Pictures from Video
« Reply #20 on: May 16, 2011, 06:54:00 pm »
I'll probably download one of the ones off youtube later
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Offline alberthrocks

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Re: Long Exposure Pictures from Video
« Reply #21 on: May 16, 2011, 07:02:01 pm »
Hehe, I remember this post and was going to reply to it, but I forgot.... now I did! :D
This is just simply an awesome program! The only issue is that this isn't compatible with Linux... but that can't be helped, and definitely doesn't take away from how awesome this is! ;)
I guess me or some other C/C++ versed member will port this little guy to Linux (compat with Mac) someday...
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Offline DrDnar

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Re: Long Exposure Pictures from Video
« Reply #22 on: May 16, 2011, 07:03:17 pm »
Here's an example of an actual long exposure for comparison. I took this a few years ago during a dark, cold winter night. It was below freezing out. I set the camera up on a tripod, put it in bulb mode, hit the shutter, and then went inside to warm up. I came back a few minutes later and ended the exposure. This is from a Canon 20D, 365 seconds, f/10, ISO-200. The exposure was a complete random guess.
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Offline Builderboy

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Re: Long Exposure Pictures from Video
« Reply #23 on: May 16, 2011, 07:09:11 pm »
I actually just did a photo portfolio on long exposures, I should put it up! O.O
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Offline thepenguin77

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Re: Long Exposure Pictures from Video
« Reply #24 on: May 16, 2011, 07:18:52 pm »
Quote from: DrDnar on May 16, 2011, 06:50:54 pm
Quote from: thepenguin77 on May 16, 2011, 06:35:42 pm
I think this might be similar to what modern digital cameras do.
Wrong. DSLRs simply leave the sensor active for the duration of the exposure. (Each photon deposits a small amount of charge into the photosite. As the exposure progresses, the charge builds up. At the end, an ADC reads out the charge level.) The main difference between a digital long exposure and film long exposure is film suffers from problems like reciprocity failure and color shifts, whereas digital sensors suffer from noise issues, even at low ISOs.
Quote from: thepenguin77 on May 16, 2011, 06:35:42 pm
If I had just summed rather than averaged, all the pictures would turn out white.
That's probably because your camera is trying very hard not to make each frame pure black, so it's pumping up the ISO. With manual control, you could fix that.

Ok, that makes sense. I forgot that the camera actually changes the picture before it gets to the computer.
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