Increasing Depth of Field


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Increasing Depth of Field
by mike faulkner on Oct 16, 2008 at 7:52:02 pm

I shot some footage of people waving at the camera.
whilst the focus point was set at infinity, I want the people in the foreground to be more blurred whilst keeping the background in focus.

is there any plug ins that can do this?
or a way to apply gaussian blur to the people

I appreciate any help

thanks
mike

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Re: Increasing Depth of Field
by Eric Sanderson on Oct 16, 2008 at 7:57:54 pm

It sounds like your in for some Roto work. You have to duplicate your footage layer, draw and animate a mask around your people and depending on if youve added or sub. your mask will depend on which layer you blur but you blur the background.

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Re: Increasing Depth of Field
by Jason Milligan on Oct 16, 2008 at 8:45:59 pm

Just to clarify, you are talking about decreasing depth of field.
This is much easier to do in post than increasing depth of field would be.

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Re: Increasing Depth of Field
by mike faulkner on Oct 16, 2008 at 9:41:20 pm

I want to make the foreground more blurred

does that make sense?
mike

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Re: Increasing Depth of Field
by david bogie on Oct 16, 2008 at 10:04:41 pm

You're facing hand drawing a mask around everything you want to remain in focus and applying a blur filter (look for real camera blurs, not just a blur). Each frame will require its own had drawn mask, 30 of them every second. Easier to reshoot it.

bogiesan

This is my standard sigfile so do not take it personally: "For crying out loud, read the freakin' manual."

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Re: Increasing Depth of Field
by Timor Kardum on Oct 20, 2008 at 10:57:46 am

no need to reshoot.
if you have a "clean frame" of the BG you can pull a "difference key".

the BG needs to be static in this case, because the difference key is keying parts that are different from the plate that you supply.

once you have extracted the FG person (try to soften the mask to avoid flickering) you can apply the blur.

to get a good looking defocus, i recommend a plugin-set like sapphire that supplies a proper "rack defocus" blur.

hope this helps,

timor

www.omgraphix.de
- identity in motion -

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