Lens Flare Question

[yoda313]

Hello,

Ok I've seen this in some action movies over the years and have wondered how it happens:



What gives????? That purple highlight off of the flare - how does that get recorded by the camera????? I thought that HOLLYWOOD movie cameras would be superior and eliminate any such anomalies????

Kevin

[Guest]

yeah,you got some on your avatar as well.

This was just like the snake scene in Radiers.They used a piece of glass to separate the actor from the dino.Hence the reflection.

[yoda313]

Hello,

Actually the avatar is from PHIL COLLINS' IN THE AIR TONIGHT Music video

So how does it happen???? Is it the moisture content in the atmosphere??? Obviously that scene from JURASSIC PARK is in the rain. But the INDIANA JONES scene you refer to wasn't. What's the factor for it????

Kevin

[Guest]

The glass is wet and much thicker than the "snake"
scene.It has to be thicker due to the sheer size of the dino. They may have had to use bulletproof as well for the same reason.This would probably cause the "red" shift you see.IMO

[yoda313]

Hello,

Hmm.... Could be.....

Though in those JURASSIC documentaries I don't seem to remember them having to place GLASS between them in the TREX scene.....

Kevin

[Ripper2860]

The glass is wet and much thicker than the "snake"
scene.It has to be thicker due to the sheer size of the dino. They may have had to use bulletproof as well for the same reason.This would probably cause the "red" shift you see.IMO

Quit screwing with him Gee --

Why would they need a piece of glass between a fake T-rex and the actors? You know it's not lens flare and that it's actually the "cold cathode" light mod they did on T-Rex.

[Blazey]

The glass is wet and much thicker than the "snake"
scene.It has to be thicker due to the sheer size of the dino. They may have had to use bulletproof as well for the same reason.This would probably cause the "red" shift you see.IMO

Woah... How the hell could GLASS hold back a fully grown T-Rex? This is absurd! Everyone knows that the Dinosaurs in Jurassic Park were HEAVILY fed so they would be less agressive towards the actors and no glass barriers would be necessary. The lens flare is caused by the Mineral Oil that was smeared on the animals (which is light reflective) to give their scales a "shiny" effect. I am surprised the director chose this route.

[yoda313]

Hello,

The lens flare is caused by the Mineral Oil that was smeared on the animals

Hmm.... you mean the animatronic puppet of course

Well it seems to be getting closer to being answered. Seems to be the best one so far.....

Thanks for the input guys

Kevin

[thecoalman]

You need to be alittle more specific

[yoda313]

Hello,

:P :P :P :P :P

That's not the original version

Kevin

[ViRaL1]

There's nothing there. You're seeing things.

[yoda313]

Hello,

Look back at the original snap shot on the first post.

Get out your copy of JP1 and watch the TREX scene again. It's right there.

I think it's even on the JEEP top rack Headlights when NEDRY gets killed by the DILOPHASORAUS - sorry if I spelled that wrong

Kevin

[Guest]

The glass is wet and much thicker than the "snake"
scene.It has to be thicker due to the sheer size of the dino. They may have had to use bulletproof as well for the same reason.This would probably cause the "red" shift you see.IMO

Woah... How the hell could GLASS hold back a fully grown T-Rex? This is absurd! Everyone knows that the Dinosaurs in Jurassic Park were HEAVILY fed so they would be less agressive towards the actors and no glass barriers would be necessary. The lens flare is caused by the Mineral Oil that was smeared on the animals (which is light reflective) to give their scales a "shiny" effect. I am surprised the director chose this route.

No,no,no.All wrong! You suggest mineral oil,but how sir ,would account for the purple shift. Mineral oil clearly causes a green shift in these situations.



Especially since the dino is coming toward the camera.Duh.

[thecoalman]

I think it's there to give Yoda a reason to up his post count, it was well thought out in advance.

[yoda313]

Hello,

Dr Gee - You care to translate that equation for the math illeterate????

And coalman - no it's just something that I was curious about

Kevin

[Blazey]

The glass is wet and much thicker than the "snake"
scene.It has to be thicker due to the sheer size of the dino. They may have had to use bulletproof as well for the same reason.This would probably cause the "red" shift you see.IMO

Woah... How the hell could GLASS hold back a fully grown T-Rex? This is absurd! Everyone knows that the Dinosaurs in Jurassic Park were HEAVILY fed so they would be less agressive towards the actors and no glass barriers would be necessary. The lens flare is caused by the Mineral Oil that was smeared on the animals (which is light reflective) to give their scales a "shiny" effect. I am surprised the director chose this route.

No,no,no.All wrong! You suggest mineral oil,but how sir ,would account for the purple shift. Mineral oil clearly causes a green shift in these situations.



Especially since the dino is coming toward the camera.Duh.

You know, this is so typical. If you are UNINFORMED, why answer? A Dinosaurs vision is comprised of different optics than humans. They cannot see the same colors as we do. Thusly, a purple light, shined at the animal is used to limit it's vision in an attempt to make for a safer filming environment. Just look at this:



As you can CLEARLY see, that accounts for the purple lens flare in this instance. It is a little known fact though, that Jeff Goldblum was eaten during filming and his stunt double has taken over his identity.

[ViRaL1]

It is a little known fact though, that Jeff Goldblum was eaten during filming and his stunt double has taken over his identity.

No big loss.

[Guest]

My good man,lest we not forget it is raining.

Relativistic Aberration
In classical physics, the aberration of light works just like the aberration of rain--it depends on the ratio of the speed you're going to the speed of light. It's only because the speed of light is so great that it takes precise measurement of the position of stars to make aberration apparent. Classical physics, then, predicts that if we were to travel at the speed of light we'd measure the aberration of light from a source orthogonal to our direction of travel to be 45°.
But that implies we could continue to accelerate past the speed of light and measure greater and greater angles of aberration, just as the TGV does when it exceeds the speed at which the rain is falling. Not possible--in special relativity no material object can attain the speed of light. When the Lorentz transform is applied to the aberration of light, we discover that the the aberration measured by an observer travelling at velocity v for light from a distant source at direction phi in the rest frame is:

[yoda313]

Hello,



So that's why LOST WORLD sucked with him as the star?????

I'm glad they were able to bring SAM NEIL in for JP3 - BIG DIFFERENCE there

Kevin

DR GEE - Why didn't you just agree with one of my earlier guesses that it had to with moisture content instead of the physics????? Wow - definetely over my head.....

[Guest]

You were on the right track Yoda.You were just using it in the wrong context.

[yoda313]

You were on the right track Yoda.You were just using it in the wrong context.

Hello,

Ok thanks for pointing that out.

So the flare can happen even when its not raining??? I mean like if its really foggy or right after a rain??????

Kevin

[Guest]

Of course my young Jedi!

[yoda313]

Hello,

Thanks for the info

Kevin

[BJ_M]

this is the dvd backup formula

[tgpo]

http://jonathanclark.com/diary/flare/

[lordsmurf]

1+1=3

[yoda313]

Hello,

Thanks for the link TGPO Very informative

Kevin

[Doramius]

God willed it and it was so. The purpose was to make those, who pay too much attention to the details of a movie, stand out so others may have the pleasure of laughing at them.

[Guest]

this is the dvd backup formula

BJ-Shouldnt that be -i? I guess it depends if you are using +R or -R.