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Bwa Crazy Lines!


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3 replies to this topic

#1
HavocRains

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this question is for kyle or neone with extensive camera knowledge:

why in the hell is there lines on computer screens (scrolling up and down) when you film them!!!1!!1 its frizacken crazie!!!1!!1

somone please explain...
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Hold on to your humanity.
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#2
FireWurX

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QUOTE (HavocRains)
this question is for kyle or neone with extensive camera knowledge:

why in the hell is there lines on computer screens (scrolling up and down) when you film them!!!1!!1 its frizacken crazie!!!1!!1

somone please explain...

because the camera has a different image refresh rate then a computer screen.

a computer screen doesnt dispay a flowing motion, but loose pictures at (for instance) 85 times every second.
Every picture is built up, row by row.
the camera only takes 25 or 30 pictures every second.
because of that, it doesnt see the whole picture on the screen, but sees a new one get built up, while the old picture fades away on the screen.
thats waht produces the lines.

#3
[MT]eamJew

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If you can picture a film reel in the classic since of hollywood you know there is multiple frames in concession...when put together fast, it moves, like the guys we used to draw in a flip book who got hit by cars. Human eye speed is really slow, at least compared to most animals. So 30fps can make a moving picture without us ever seeing the transistion (the little line) from one frame to the next on that reel. However...if you have one film going at a rate of 30fps..and another recording at a rate 45 fps...then it is fast enough to catch those 30 frames in a second...plus 50 percent more of what's going on...which may be almost all of the borders around the frames. Like two moving cars, the differential is only 15fps...when chasing each other..or played back...which is not too fast for us, and we can catch it. The less that the difference is from recording speed to playing speed, the less lines it'll produce on the final playback. Normally on a computer screen this can be at least reduced by changing the refresh rate closer to 30fps or even something like 27.9fps. 30fps is a generic industry standard for something like network television.
Faster speeds are obviously beneficial because when filming movement you'll have greater clarity. So that at times when you decide to slow it down or look at it terms of a single frame, you'd have less blur around something moving...like the still shot of FPS Doug. No matter what there will always be some degree of a blur, because you can't record faster than the speed of light that it takes to get to doug and back from the camera.
I believe it's fly's who have the fastest comprehension of light with their advanced multi-faceted eyes. To them, tv's look like static and lines all the time. Many animals can see the lines just fine.
My real concern is that I can't seem to leave a short post...maybe I'm just a big forum n00b..damn it...so it's just like he said, but maybe this is explained a lil better.
[MT]eam Pwnage @ www.magictrailer.com

#4
Bait

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Well, I use to videotape arcade monitors and there's a setting on your camera that can make the lines go away. But Kyle prolly has a reason for not using that setting since his focus would be more on Jeremy then the monitor.




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