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Maria Mueller
Twixtor - how slow can it go? How many pictures can it generate?
on Mar 26, 2010 at 8:22:16 am

Hey guys,
I'd like to do time lapse smoother with Twixtor and I want to save picture-trash.

So my question:
How many pictures can Twixtor generate between two?

Two Example:

1. A mushroom growing out from the earth can last 2 days.
So is possible to shoot f.e. just 25 pictures over that period.
So I get 1 film second and that let Twixtor extend it to 7 sec?
Does it still looks realistic?

2. The extreme situation is, that I miss the photos while the mushroom head is opening.
So my A-picture would be the mushroom head on the earth and the B-picture would be mushroom peduncle has grown some centimeters and the head is fully opened.
Is it possible for Twixtor to generated the missed pictures between A and B?

I would think Twixtor definitly need more pictures from the opening and growing of the mushrooms peduncle?
What do you think, do you already tried such a time lapse (may be with opening flowers etc.)?

Is there another software which can generate/ morph so many pictures between A and B?

Thanks a lot guys.
Maria



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Pierre Jasmin
Re: Twixtor - how slow can it go? How many pictures can it generate?
on Mar 27, 2010 at 3:27:47 am


From two pictures you can generate as many in-betweens as you want.

Will it look good? Well it depends on how different they are.

This process is more sensitive to actual motion (example caused by wind) then color shifts caused by for example a passing cloud.

So depending on the subject as a rule of thumb try not to go over 5% motion (example 1000 pixels, 5% is already 50 pixels)- and over that unless it's a uniform motion it probably becomes a morph job.

We have a morpher too called RE:Flex which has a tool called RE:Flex morph (still morpher) where you locate some pix at point in time on the timeline and it helps you create the in-between and you help it by placing shape guides to set matching correspondances.

Of course seems easier when possible to start with more frames then less - more frames means less manual work / more controlled results.

Pierre



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Maria Mueller
Re: Twixtor - how slow can it go? How many pictures can it generate?
on Mar 29, 2010 at 2:13:05 pm

Thanks Pierre.

To your last thought ... well I think the same like you. Better to do it right in reality then try to simulate it digital.
But my boss don't want to shoot to much pictures,so
I will test Twixtor and maybe Re.Flex the next dayy, to find out how many/ less pictures they would need for a growing plant.

Cheers.
Maria


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Brice Coustillet
Re: Twixtor - how slow can it go? How many pictures can it generate?
on Apr 22, 2010 at 4:40:44 pm

Hey Pierre,

What do you mean exactly by "try not to go over 5% motion" ?

I really don't get it...

Thanks a lot

brice


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Pierre Jasmin
Re: Twixtor - how slow can it go? How many pictures can it generate?
on Apr 22, 2010 at 4:57:26 pm


Just giving you an hint
5% of a 1000 pixels wide image is 50 pixels (which is already a lot)
If a point moves 50 pixels in one source frame time, there is a good chance the automatic analysis will fail, leaving you with labor intensive task of building mattes, placing tracking shapes, and possibly retouching with a paint system.

Pierre



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Brice Coustillet
Re: Twixtor - how slow can it go? How many pictures can it generate?
on Apr 22, 2010 at 5:11:59 pm

Now i understand !

Thanks a lot for the (very) quick reply.

Brice


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