« previous next »
Pages: 1 [2]   Go Down

Author Topic: Long Exposure Pictures from Video  (Read 10291 times)

0 Members and 1 Guest are viewing this topic.

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
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
Logged
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Offline ztrumpet

  • The Rarely Active One
  • CoT Emeritus
  • LV13 Extreme Addict (Next: 9001)
  • *
  • Posts: 5712
  • Rating: +364/-4
  • If you see this, send me a PM. Just for fun.
    • View Profile
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
Logged

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
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
Logged
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Offline DrDnar

  • LV7 Elite (Next: 700)
  • *******
  • Posts: 546
  • Rating: +97/-1
    • View Profile
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 »
Logged
"No tools will make a man a skilled workman, or master of defense, nor be of any use to him who has not learned how to handle them, and has never bestowed any attention upon them. . . . Yes, [] the tools which would teach men their own use would be beyond price."—Plato's The Republic, circa 380 BC

Offline ztrumpet

  • The Rarely Active One
  • CoT Emeritus
  • LV13 Extreme Addict (Next: 9001)
  • *
  • Posts: 5712
  • Rating: +364/-4
  • If you see this, send me a PM. Just for fun.
    • View Profile
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
Logged

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
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
Logged
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Offline alberthrocks

  • Moderator
  • LV8 Addict (Next: 1000)
  • ********
  • Posts: 876
  • Rating: +103/-10
    • View Profile
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...
Logged
Withgusto Networks Founder and Administrator
Main Server Status: http://withg.org/status/
Backup Server Status: Not available
Backup 2/MC Server Status: http://mc.withg.org/status/


Proud member of ClrHome!

Miss my old signature? Here it is!
Spoiler For Signature:
Alternate "New" IRC post notification bot (Newy) down? Go here to reset it! http://withg.org/albert/cpuhero/

Withgusto Networks Founder and Administrator
Main Server Status: http://withg.org/status/
Backup Server Status: Not available
Backup 2/MC Server Status: http://mc.withg.org/status/

Activity remains limited due to busyness from school et al. Sorry! :( Feel free to PM, email, or if you know me well enough, FB me if you have a question/concern. :)

Don't expect me to be online 24/7 until summer. Contact me via FB if you feel it's urgent.


Proud member of ClrHome!

Spoiler For "My Projects! :D":
Projects:

Computer/Web/IRC Projects:
C______c: 0% done (Doing planning and trying to not forget it :P)
A_____m: 40% done (Need to develop a sophisticated process queue, and a pretty web GUI)
AtomBot v3.0: 0% done (Planning stage, may do a litmus test of developer wants in the future)
IdeaFrenzy: 0% done (Planning and trying to not forget it :P)
wxWabbitemu: 40% done (NEED MOAR FEATURES :P)

Calculator Projects:
M__ C_____ (an A____ _____ clone): 0% done (Need to figure out physics and Axe)
C2I: 0% done (planning, checking the demand for it, and dreaming :P)

Offline DrDnar

  • LV7 Elite (Next: 700)
  • *******
  • Posts: 546
  • Rating: +97/-1
    • View Profile
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.
Logged
"No tools will make a man a skilled workman, or master of defense, nor be of any use to him who has not learned how to handle them, and has never bestowed any attention upon them. . . . Yes, [] the tools which would teach men their own use would be beyond price."—Plato's The Republic, circa 380 BC

Offline Builderboy

  • Physics Guru
  • CoT Emeritus
  • LV13 Extreme Addict (Next: 9001)
  • *
  • Posts: 5673
  • Rating: +613/-9
  • Would you kindly?
    • View Profile
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
Logged

Offline thepenguin77

  • z80 Assembly Master
  • LV10 31337 u53r (Next: 2000)
  • **********
  • Posts: 1594
  • Rating: +823/-5
  • The game in my avatar is bit.ly/p0zPWu
    • View Profile
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.
Logged
zStart v1.3.013 9-20-2013 
All of my utilities
TI-Connect Help
You can build a statue out of either 1'x1' blocks or 12'x12' blocks. The 1'x1' blocks will take a lot longer, but the final product is worth it.
       -Runer112
Pages: 1 [2]   Go Up
« previous next »