Blurring all but moving objects?

[Ogrus]

I have a clip of a man chasing a dog. I would like to blurr or unfocus the whole scene except the man and the dog which should be clear....
¿How would you do this?
I have been told mask.. but i need a more precise explanation.
Mask the dog and the man and animate it?
And then?

[Drew Ott]

Buy a 35mm adapter and do it again.

[nicholasraeburn]

Ummmm blur it maybe.:Drogar-Evil(DBG):

[AndrewKramer]

Check out the tutorial on Depth of Field here www.videocopilot.net/tutorials.htm (http://www.videocopilot.net/tutorials.htm)

basically, instead of a gradient make a whitle layer with a pen mask around the objects and animate it over black. Then precompose the result and use as the blur element as described in the tutorial.

You can also duplicate the layer, blur the background layer, then draw a mask around the subject and feather the edges of the mas this way they are in focus and the bg is not, then animate the masks shape paraments every few frames.

Andrew

[Ogrus]

Buy a 35mm adapter and do it again.



Give me something else
I dont want DOF, I dont need the background out of focus (this is a crazy chase involving many different p.o.v)
It can only be done in AE and it involves masks
Do you have a better solution?


PS: I cant be filmed again so think twice b4 posting!

[Ogrus]

Andrew!
An honor that you reply to my post and come to my aid
I need it the other way round.
The moving objects have no movement blurr, the static objects (chairs, tables, lamps) do
I will try your suggestions thou!

[t-h-e-w-h-o]

i would rotoscope out the guy/dog and duplicate the layer, then i would apply fast blur and also turn on motion blur. (i would initially JUST see how it looked with motion blur turned on on the layer under it)

[Ogrus]

Thanks to everyone that gave wise advice!

[R!ff R4ff]

I'd say it depends on how much footage you need to do this to and what it looks like. Certianly rotoscope will work but that may turn out to be a HUGE time investment in which case you are better off re-shooting it just because it would be cheaper (unless your time means nothing to you).

Motion mapping is a choice if you have something high contrast it will lock onto.

Depends on the footage though.

[Steve_Arm]

i would rotoscope out the guy/dog and duplicate the layer, then i would apply fast blur and also turn on motion blur. (i would initially JUST see how it looked with motion blur turned on on the layer under it)

Motion blur works on moving layers in the composition, not moving data inside a layer.

[Ogrus]

Motion blur works on moving layers in the composition, not moving data inside a layer.

Exactly and that is what i need

Rotoing the moving objects is the first step. Its only 10sec (part of a 3osec clip) so not that bad

I´m going to try to explain to the best of my ability what i would like to achieve.

An example:

A man walking parallel to a wall. He is walking towards the left. The wall is obviously static but what i want you to see is as if the wall was sort of slightly moving to the right, slightly streching and slighty blurred leaving a little trail behind. A sort of "sucking -jumping into hyperspace a la starwars" buy very very subtle.

[Steve_Arm]

Is this your clip with the wall or just an example?
I have some thoughts. If the wall occupies the whole frame then it will be imposiblle to give the idea that a wall is moving even if you move it. On the other hand it will be easier to replicate just a wall on the background. You can also separate the wall by using many layered keying plugins.
Now if it's not a wall you have only one way to roto the person and replicate the missing part from the bg since it will show when you move it the opposite direction from the person.