Re: çhroma keying with FF

["Kermit Woodall" <kermit@novadesign.com>]

You could probably hit the basics of the bluescreening methods through FF -
but a good deal of code is needed to make the pulled keys look right and to
prevent the color keying from affecting the foreground person/object. This
would be beyond what FF can do, although FM might be able to do it. Of
course, since we sell a bluescreening plugin for Photoshop I'd prefer you to
buy ours! It's on sale too. $99.95 if you call 1-800-IMAGE-69 this month
only.

Kermit Woodall
http://members.aol.com/dgdominion

----- Original Message -----
From: Alfredo Luis Mateus <almateus@globalsite.com.br>
To: FFDG <ff@aurdev.com>
Sent: Sunday, June 13, 1999 11:34 AM
Subject: çhroma keying with FF


> > Dear FFDG
> >
> > Am new to filter factory and would be most grateful if you guys could
> > give
> > me any suggestions on filters that can mimic travelling Matte / Chroma
> > key.
> > Blue and green.
> >
> > I know there are several proprietary  plug  ins on the market, but I
> > am interested in seeing what  can be achieved  in ff.
> >
> > If I want to lift foreground  objects  off blue  or green screen
> > backgrounds. To composite onto  different scenes. .
> > In ideal circumstances  such backgrounds  would  have  good density
> >  and the minimum  of red green contamination.
> >
> > The  only  image  in Photoshop 5 (samples) that is at all indicative,
> > is the CMYK balloons. This exhibits  too much variation to be an ideal
> > subject; but as a point of discussion. I have experimented with  some
code, trying  to remove the sky area without  effecting the foreground.
> > As follows.
> >
> > R:
> > ( r>40&& r<80) ? (b>100? R-90: r-0) : (b<70?  r-0 : r )
> > G:
> > g>140?(b>145 ? g-150:g-20 ) :g
> > B:
> > b.140?(g>80?b-200:b-0):b
> >
> > Werner Streidt gave me some valuable  input  on this.
> > It works quite well within a limited range, but when the range is
> > extended
> > red tears through in the foreground.  Can I improve on this?
> >
> > Also is it possible  to remove blue /green information  and leave
> >  this area
> > as RGB 255 white  / instead of black.
> >
> > Werner also  suggested  that I might try working with the hue chroma.
> >  and he indicated that there   had been some  previous  discussion this
> > topic  on the FFDGG.
> > So far I havent been able to locate this. any  ideas where  this
> > might live.
> >
> > Also any  books / literature this topic/ chroma key .
> >
> > Many thanks.
> >
> > David Joe Bruton.
> > London UK