Re: [Gimp-user] Change background and leave foreground

[Burnie West <west ieee org>]

On 10/26/2012 11:41 AM, Burnie West wrote:
> On 10/26/2012 08:10 AM, Alexandre Prokoudine wrote:
> > Fran,
> >
> > The general principle is:
> >
> > 1. Select objects with selection tools.
> > 2. Cut and paste them to a new layer above the original layer (Ctrl+X, 
> > Ctrl+Shift+V).
> This doesn't work for me - it creates a new image not a new layer.
>
> I've had more success using the free select tool doing a piecewise-linear 
> close boundary around the object(s).
>
> I usually use antialiasing with feathered edges set at radius 2 pixels, trace 
> around the foreground objects (at whatever level of magnification I find most 
> convenient) using the sliders on the bottom and right to focus on where I am 
> working, and then (Ctrl-x, Ctrl-V, Layer->New Layer) to keep the image 
> properly placed within the background.
By the way, while you are making this piecewise linear selection, be very 
careful NOT to click in either of the rulers at the top or left of the image 
window (if they are displayed) because the selection you've already made will 
disappear and you'll have to start all over. This is a known bug.
> If the image is complex enough to break it in pieces to separate the 
> background, then don't use antialiasing or there will be cut-line residues.
>
> > 3. Change the background layer so that the object are unaffected.
> >
> > There are many ways to select objects. I suggest you have a go at 
> > http://docs.gimp.org/2.8/en/gimp-tool-foreground-select.html.
> This process is a new one for me - it seems at first try to take as much 
> detailed attention and more work. I've also tried the scissors tool but it 
> can't trace around edges as well as my hand-done piecewise linear feathered 
> edges approach.
>
>   -- Burnie
>
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