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Graphics > GIMP (GNU Image Manipulation Program) > Re: Removing ba...
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Re: Removing background color from foreground object

by mkwired@[EMAIL PROTECTED] Jul 10, 2008 at 07:42 AM

On Jul 10, 8:36=A0am, fl...@[EMAIL PROTECTED]
 (Floyd L. Davidson) wrote:
> mkwi...@[EMAIL PROTECTED]
 wrote:
> >On Jul 9, 8:01=A0pm, Owen <xem...@[EMAIL PROTECTED]
> wrote:
> >> On Jul 10, 4:46=A0am, mkwi...@[EMAIL PROTECTED]
 wrote:
>
> >> > On Jul 9, 9:08=A0am, Owen <xem...@[EMAIL PROTECTED]
> wrote:
>
> >> > > On Jul 8, 10:51 pm, mkwi...@[EMAIL PROTECTED]
 wrote:
>
> >> > > > How can one remove the color of the background from the
foregrou=
nd
> >> > > > object? =A0When someone stands to close to a green/blue screen
w=
hen a
> >> > > > picture is taken, the color of the screen is mixed with the
edge=
s of
> >> > > > the object. =A0I think this is called "color spill." =A0I think
=
somehow
> >> > > > using the color channels of GIMP will help.
>
> ...
>
> >Original
image:http://www.2shared.com/file/3571495/e6f0e866/IMG_0656.htm=
l
>
> You are in luck, and that one is easy to do. =A0If it were
> anything other than a gray colorless object it would be
> exceedingly difficult to keep other colors and only
> delete a single hue. =A0But in this case all you really
> need to do is delete *all* color!
>
> Use paths, or the lasso selection tool, to select the
> area of that object. =A0Go all the way to the top of it,
> because you don't want any lines marking affected areas
> from those not affected. =A0If you zoom in it will be much
> easier to get it right. =A0Note that the transition from
> foreground to background is never just a one pixel is
> and the adjacent pixel is not, but rather a 3 to 6 pixel
> gradient. =A0Try to select at about 1 or 2 pixels into the
> gradient, towards that forground object. =A0(Experience is
> a good teacher, so try the whole thing three or four
> times, and you'll get better results each time.)
>
> Once you have a good selection area, go to the Colors
> menu and select "Hue-Saturation". =A0Then you have some
> options on what you want. =A0If you desaturate with it set
> to "Master", all color is removed (it looks pretty good
> too!). =A0If you pick blue first and then cyan, you can
> remove only the reflection of the blue foreground, and
> leave that little bit of red along the left side in. =A0Or
> you could desaturate the red and leave the blue in. =A0And
> you can pick just how much of it is gone too.
>
> --
> Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
> Ukpeagvik (Barrow, Alaska) =A0 =A0 =A0 =A0 =A0 =A0 =A0fl...@[EMAIL PROTECTED]
 you!  It works extremely will for this example image.

Would it be possible to use a layer to change the amount of de-
saturation or hue?
 




 15 Posts in Topic:
Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-08 07:51:10 
Re: Removing background color from foreground object
Owen <xemoth@[EMAIL PR  2008-07-09 06:08:17 
Re: Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-09 11:46:26 
Re: Removing background color from foreground object
Owen <xemoth@[EMAIL PR  2008-07-09 17:01:38 
Re: Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-09 19:41:21 
Re: Removing background color from foreground object
Owen <xemoth@[EMAIL PR  2008-07-10 04:41:30 
Re: Removing background color from foreground object
floyd@[EMAIL PROTECTED]   2008-07-10 04:36:51 
Re: Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-10 07:42:42 
Re: Removing background color from foreground object
floyd@[EMAIL PROTECTED]   2008-07-10 09:52:02 
Re: Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-10 14:16:45 
Re: Removing background color from foreground object
Ofnuts <o.f.n.u.t.s@[E  2008-07-11 01:04:12 
Re: Removing background color from foreground object
floyd@[EMAIL PROTECTED]   2008-07-10 15:16:44 
Re: Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-10 19:20:55 
Re: Removing background color from foreground object
Ofnuts <o.f.n.u.t.s@[E  2008-07-12 00:29:43 
Re: Removing background color from foreground object
mkwired@[EMAIL PROTECTED]  2008-07-10 19:21:56 

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tan12V112 Thu Dec 4 17:24:34 CST 2008.