Jump to content


Photo

Question for shooting for keying out colors


  • Please log in to reply
4 replies to this topic

#1 Logan Triplett

Logan Triplett

    New

  • Basic Members
  • Pip
  • 4 posts
  • Student
  • Bozeman, MT

Posted 17 November 2008 - 03:54 PM

So i'm shooting for my final cinematography project next weekend for college. The group that I'm shooting with wants to have shots where everything is black and white except for this paint that some guy is painting with.

I was thinking that we could have all of the paints green screen green, and just key out everything. Next I would take the keyed out image and convert it to monochromatic, next I would overlay that on top of the original image, rendering the specific colors visible. Then I would change hue of the green to get the color I wanted.

Would this work?

I'm shooting with hvx200a and a letus. If done right the only kink I am seeing is that I would be restricted to one specific color. Is there anyway to work around this? Could I use two specific different colors to key? like green and the red screen?

Sorry if this sounds confusing, I'm in class trying to listen at the same time ha.

Please email me if you have any input at redmagicmarker@hotmail.com

Thanks!

Logan
  • 0

#2 Chris Keth

Chris Keth
  • Sustaining Members
  • 4427 posts
  • 1st Assistant Camera
  • Los Angeles

Posted 17 November 2008 - 05:56 PM

You could pull different keys like you are suggesting. Just remember that cleaning up those mattes will get very tiresome and time consuming if you go over a couple of colors because the more colors you try to key with, there is a greater likelihood of those colors also being found in your talent, wardrobe, set, etc. Also, places where the two colors of paint mix will have to be added-to or subtracted-from to the matte by hand.
  • 0

#3 Logan Triplett

Logan Triplett

    New

  • Basic Members
  • Pip
  • 4 posts
  • Student
  • Bozeman, MT

Posted 18 November 2008 - 05:04 PM

yeah thats what i was thinking. I'm going to try to work around things by having nothing interact with the frame, or doing some extreme close ups, and then only do a minimum of the green screened shots.
  • 0

#4 Tom Hepburn

Tom Hepburn
  • Basic Members
  • PipPipPipPip
  • 341 posts
  • Other
  • Chicago-land

Posted 18 November 2008 - 05:53 PM

If it were me, and it's not, I would consider doing this in post. However, that may not be what your instructor is trying to teach you with this assignment. I would check first if this is an option.

In AfterEffects there is a plug in called leave color. It takes a little tweaking, like everything seems to need in post, but with some masking it should work nicely. Of course I would do a test first. If for example you want to keep the red paint red, you would want to make sure that there is no other Red in the footage. Mostly cyan would probably be best. That would save a lot of masking later.

Thought I'd mention it.

Tom
  • 0

#5 Jim Hyslop

Jim Hyslop
  • Basic Members
  • PipPipPip
  • 213 posts
  • 2nd Assistant Camera
  • Toronto, ON, Canada

Posted 30 November 2008 - 10:38 PM

You could pull different keys like you are suggesting. Just remember that cleaning up those mattes will get very tiresome and time consuming if you go over a couple of colors because the more colors you try to key with, there is a greater likelihood of those colors also being found in your talent, wardrobe, set, etc. Also, places where the two colors of paint mix will have to be added-to or subtracted-from to the matte by hand.

A garbage matte would help a lot - create the matte the same size as the painting area. If necessary you could rotoscope a matte around the actor, although that's very tedious and time-consuming (been there, done that, prefer not to do it again if I don't have to).

--
Jim
  • 0


Willys Widgets

Glidecam

Gamma Ray Digital Inc

The Slider

Broadcast Solutions Inc

Paralinx LLC

Aerial Filmworks

Rig Wheels Passport

Ritter Battery

Metropolis Post

CineLab

Media Blackout - Custom Cables and AKS

Abel Cine

CineTape

FJS International, LLC

Technodolly

Visual Products

rebotnix Technologies

Wooden Camera

Opal

Tai Audio

Visual Products

Abel Cine

Technodolly

Opal

FJS International, LLC

Media Blackout - Custom Cables and AKS

Metropolis Post

Broadcast Solutions Inc

CineLab

Rig Wheels Passport

Paralinx LLC

The Slider

Glidecam

Tai Audio

Willys Widgets

Aerial Filmworks

Ritter Battery

CineTape

rebotnix Technologies

Wooden Camera

Gamma Ray Digital Inc