Infared question

blacksheep699 wrote on 11/16/2004, 6:24 PM
Ok...im makin this movie where i need an effect where there is infared...so i applied the infared effect from Vegas to my clip but the colors are not where they are supposed to be like all the hot spots that are really red are like green or blue...is there any combination or preset some one can help me with to get it proper? because ive been fiddling with the curves for about 2 hours now and i still cant get this crap to work.

Comments

Jay Gladwell wrote on 11/17/2004, 7:25 AM
What would happen if you inverted the image (made it negative) then applied the infared filter?

Jay
Grazie wrote on 11/17/2004, 7:40 AM
Just tried Jay's clue .. but I used Invert with 100% . . I've used this before for a kinda Infra Red effect . .Now of course Infra red when used in the "real" world picks up on heat radiation, and yes I understand you realise this. . but here is a "look-a-like".

I can email you a screen grab if interested?

So a 2 Link Chain:

Link 1 - Colour Curves:
Show all channels
Infrared Preset

PLUS:

Link 2 - Invert:
100% inversion

Any good?

Grazie
blacksheep699 wrote on 11/18/2004, 6:20 AM
grazie..email me that screen grab thing... blckhawk542@yahoo.com

When i put on the effect...i get alot of green on the person's faces even with the infared on 100%

wats wrong?

Im lookin for just the infared effect..where all you can make hot spots on peoples faces and stuff...if youve seen predator...then you would know..something like that....by the way how did they make the infared look back in the 80's with out computers?
Grazie wrote on 11/18/2004, 7:44 AM
.. deep breath . ..

OK .. . oHmmmmm.....

Well, you do realise that Vegas wont pick out Hot Spots ? .. it wont pick out the colour that relates to ONLY a hot area like that which is emitted from a . .well, hot face. One could select the pinky colour of a white person - but what are you gonna do with a perason who is black or dark brown or . .anything other than the pinky colour . . hmmm..? Vegas wont do Infra Red in the way you are asking. Predator .. if my memory serves me well, most likeley dealt with a lot of green screening for the Pred to be able to "see" the colour grads of a person "against" the cooler jungle foliage .. What you are attempting to do using an FX is to pick out the hot peaks on a person against, I guess, cooler areas - yeah? Well, that aint gonna happen. BUT! With a judicous use of Beziers and Masks and Chromakeying I suspect you could "isolate that which you want ed Infra-redded and THAT which is "cool" but it isn't gonna happen in simple FX application . . sorry but no. What I did was an affectation of colours .. a bit like which you are getting suspect.

As I hadn't got a response from you, I deleted the sample, however you do have my recipe for the FXs I tried.

If you could make a kinda "moving" Bezier mask of the areas you guess would be hot, you could then mask ouot the backgorund - make black or whatever - and then red-up the areas for Infra-redding - yeah? Now you can get funky trying to FX just the Hot spot mask to give the "look" of Infra-Red tracking.

I think you and I have had our collective heads turned by the title of the FX being INfra-Red .. when in reality - IMHO - it is something that "appears" to be Infra red . . it never COULD not be anything else other than an affectation of what we think or percieve to be INfra Red .. . have you got it now? How could Vegas read hot or cold? All you are gonna get is all the colours being treated by a digital FX, not being selected against radiant temperature - yeah? You sure you've got this now?
" . . where all you can make hot spots on peoples faces and stuff . ." just aint on the agenda unless you USE an infra red cammie OR do one of labourious treatments I've suggested above - my guess for Pred would have been green/blue Chroma Keying screening OR actual infra red OR a mixture of both with a BIG dollop of kidology goping on - yes?

Now, somebody gonna contradict this one .. ? Please do I'm all ears . .very ugly too .. HAH!

Best regards,

Grazie
johnmeyer wrote on 11/18/2004, 7:46 AM
You might try shooting with a Sony cam using a ND filter and then enable the "infrared" super low-light mode. In addition, set the shutter to 1/15 of a second which will give some slight smearing of the video. Finally, if you want hot spots, you can use the glow fX, or just play with the color curves, moving the top of the curve up to slightly overexpose the highlights.
Grazie wrote on 11/18/2004, 8:14 AM
. . but you DO need highlights .. and you do need something to grab hold of . . Infra red FX doesn't just do .. er .. Infra red . well it wouldn't . .would it! That's been my point here . .I hope BV got this .. g