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ctalkeb on 22 January 2010
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JHawkNH said:
ctalkeb said:
JHawkNH said:
Does anyone know the answer to this question?
I keep hearing about people getting headaches from 30 FPS in games, but nobody complains about getting headaches at a 24 FPS movie. Why is that?

Well, you'll get a headache if those 30 or 24 frames were just thrown out there at that speed, but that isn't what's happening. Rather, a single image is displayed several times making sure that you don't get a "flickery" effect. For 3D though, if you can only display @60 hz, those are divided between your eyes and you'll actually notice that flickering.


I was actually talking about movie theaters where it is 24 frames per second.  Not video signals where 24 fps has been converted to 60 fps.

If lower fps can cause headaches, then 24 fps (or watching a movie at a theater should cause more headaches then a 30 fps video picture.

And I quote wikipedia for your pleasure:

"A commonly-held misconception is that film projection is simply a series of individual frames dragged very quickly past the projector's intense light source; this is not the case. If a roll of film were merely passed between the light source and the lens of the projector, all that would be visible on screen would be a continuous blurred series of images sliding from one edge to the other. It is the shutter that gives the illusion of one full frame being replaced exactly on top of another full frame. A rotating petal or gated cylindrical shutter interrupts the emitted light during the time the film is advanced to the next frame. The viewer does not see the transition, thus tricking the brain into believing a moving image is on screen. Modern shutters are designed with a flicker-rate of two times (48 Hz) or even sometimes three times (72 Hz) the frame rate of the film, so as to reduce the perception of screen flickering. (See Frame rate and Flicker fusion threshold.) Higher rate shutters are less light efficient, requiring more powerful light sources for the same light on screen."