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Lighting question

Posted: Fri, 1st Jan 2010, 5:23pm

Post 1 of 6

khobar95

Force: 1000 | Joined: 30th Dec 2009 | Posts: 16

VisionLab User

Gold Member

I'm new to VLS and am starting off with something rather simple - the mystic blue orb light thingy. I added the orb to some footage of my son and now want to add some lighting effects - the blue light reflecting off of him and the floor, etc. Can this be done? As it is now I have him "throwing" the orb and I'm happy enough with the orb I added, but without the lighting it looks painted in.

I don't have a huge amount of additional software - Gimp and Commotion Pro are about it.

Thoughts?

Thanks in advance,
Paul
Posted: Fri, 1st Jan 2010, 6:53pm

Post 2 of 6

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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SuperUser

While it is possible to do it in post, almost always it is easier and better to get the lighting right when filming than to change the lighting afterward.

What you should do is use a blue light on set to illuminate the area that will eventually be illuminated by the effect, so that when the effect is added, it composites in convincingly.

To do it in post requires lots of masking and rotoscoping by hand, frame-by-frame, then using grading filters to alter the color and brightness to simulate the light.
Posted: Fri, 1st Jan 2010, 7:31pm

Post 3 of 6

khobar95

Force: 1000 | Joined: 30th Dec 2009 | Posts: 16

VisionLab User

Gold Member

Hi Axeman,

I agree with everything you said. The problem is that this wasn't part of a movie shot on a set. It was shot at a karate tournament as part of a performance, so the existing lighting in the video is what it is.

I came across this thread: http://fxhome.com/forums/viewtopic.php?t=39392

That sounds a lot like what I'm wanting to do. For example, I saw mention of a glow composite filter combined with a mask? I've added "Angelic Glow" just because it contained the word "glow" in it (IOW, for no particular reason) and I see "Composite-Glow: composite. I don't think I should be trying to adjust "Angelic Glow" to fit my needs, but at least I see some of the settings.

So I'll ask - what would you recommend?

Edit: I've changed from the blue orb to "Force Lightening" which my son likes better. I believe this might also be easier to work with.

Edit: One idea that I had for the reflection off the ground - in Commotion I could create a "shadow" - I'm wondering if I can do something similar in VLS and then add some kind of glow to that? As for getting the reflection off my son, I'm not sure what the best method would be.
Posted: Sat, 2nd Jan 2010, 7:07am

Post 4 of 6

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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SuperUser

You'll have to use animated masks to isolate the glow/cast light of the effect on your son, I reckon, and not on the surrounding bits of the frame.

This tutorial covers a similar effect for lightsabers; the principles will be the same.
Posted: Sat, 2nd Jan 2010, 5:00pm

Post 5 of 6

khobar95

Force: 1000 | Joined: 30th Dec 2009 | Posts: 16

VisionLab User

Gold Member

Nice Axeman, thanks very much. That takes care of the floor reflection very nicely.

And thank you for pointing to the "Tutorials" - excellent.

Paul
Posted: Mon, 4th Jan 2010, 9:26am

Post 6 of 6

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

As Axeman says, the more 'live' lighting you can do the better. However, as you point out, that isn't always possible. razz

In this short film you can see there's quite a lot of artificial lighting involved, particularly during the lightsaber and lightning sequence:



This was done mainly using grade objects and carefully selective masking, to alter the brightness/contrast in specific areas.

A more complex alpha shift technique was also used to create the fake rim lighting on the actors - this is only really practically possible if they've been shot on greenscreen, though. I hope to do a proper tutorial on it sometime soon.