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Old January 22nd, 2003, 10:51 PM   #1
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Fast Strobe FX

Hi,

I'm looking for an effect that gives a fast strobe effect (at frame resolution if possible, 25fps PAL). I know it is possible (I think it's a freeze of some frames in interlaced mode).

Is there any software or plugin for that? I'm using a PC.

Thank in advance.
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Old January 23rd, 2003, 02:42 PM   #2
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Perhaps an idea might be to insert a couple of pure white frames
every so much frames? This ofcourse would not be doable if you
need to do this for a long time then a few seconds...
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Old January 23rd, 2003, 04:06 PM   #3
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Rob Lohman wrote:
>This ofcourse would not be doable if you
>need to do this for a long time then a few seconds...

Yes, this is why I need a software or a plugin to do that, or maybe a good trick to emulate this in a software.
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Old January 24th, 2003, 05:19 AM   #4
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If you are good in programming this should not be to difficult
to program as a plugin I think.
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Old January 24th, 2003, 07:56 AM   #5
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What exactly do you mean by strobe effect?

If you mean that the motion seems to jerk a few times a second, you can quickly do this in Premiere (or any other NLE I guess), by first speeding the clip up by a factor x, saving the result, importing the faster clip and slowing it down by the same factor. This should give every x'th frame repeated x times.

If you mean that there seem to be flashes every few frames, then it's a bit trickier to do quickly. The flash should just make everything brighter, not pure white, so I'd adjust gamma up for a couple of frames a few times a second, but making this repeat may be laborious. It's easy with Digital Fusion (say), but I haven't found a way of doing it in After Effects. Any ideas?

Julian
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Old January 24th, 2003, 10:11 AM   #6
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There are a number of ways to do this. In Premiere there is a filter - "posterize time" which can do what I think you are talking about. You can do the same thing in Vegas by undersampling the frame rate, though I haven't tried it.

You can also just grab stills from the footage and add black or white flashes between, depending on exactly what look you are going for.

Rick
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Old January 24th, 2003, 10:59 PM   #7
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thank to all replies, but what I want to do is not to add black or white frames. It's a sort of strobe effect but not a real strobe, it's like you have a video at 18 or 20fps by second, but it's really 25fps, and more fluid than 18 or 20fps. This effect was done in 1994 in a French TV show called TARATATA. From the infos that I have, somebody who has worked on the show told me that it's a freeze of a half field. I don't know if he really wants to say half field or one field of two. I just know the effect was done on analog and not digital.
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