Long exposure effect (links included)

phiol's icon

Basically I would like to find a way to composite several "photoshots (maybe 5to8)" using jit.qt.grab to [jit.matrix @thru 0], having little to no alpha fade when doing feedback.

here are images and patches (below) that demonstrate what I'd like to accomplish:

composite :

and I would like to do it with a strobe light to mimic this following one

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Here are a few methods I've explored but with no complete success.

Max Patch
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-method 1.a)
using slide and an open/close shutter approach

Max Patch
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-method 1.b)

Max Patch
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method 2.
Maybe a way using jit.gl.node @erase_color 0 0 0 0.01

Method 4
feedback no fade out and transparency like link number 2.

Find a way to do jit.qt.grab image feedback , where every snapshot is added to a
top layer this way there is no fade alpha blending.

Endless thanks to all in advance.

p.s. I'm sure I'm missing an info that will make this much more simple than these approaches.

phiol

Ste's icon
Max Patch
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About 4, maybe you can try by adding only the difference between current and previews frame to the current frame.
Something like this.

phiol's icon

Hi STE, thanks for the response and nice patch.

Did you have a chance to look at the link I posted ?
They demonstrate what is intended.

I don't know if I'm using your patch correctly, but the results it gives me is a highlighted flair.
Is that what you intended ?

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I ending up finding a solution using this patch.

Basically, the subject (Me :-)!) in a dark room or in front of a dark background
and I use jit.slide @slide_up 1. @slide_down 20.

it basically gave me the result of link 2.

Max Patch
Copy patch and select New From Clipboard in Max.

here it is