Re: [Gimp-user] Change background colour with GIMP 2.10.22

[Zoltán Kluik <numizmatikakz gmail com>]

Sorry  I forgot to write, that I'm using kubuntu (ubuntu wiht KDE graphic
screen) and I have only 4 GB RAM.



Zoltán Kluik <numizmatikakz gmail com> ezt írta (időpont: 2021. márc. 25.,
Cs 17:32):

> Dear Liam,
>
> Yes, the image is in RGB colour 8 bit.
> What does it mean?
> "to use select -> grow by 1 oe 2  pixels and then select shrink to remove
> small unselected dots."  Please explain it.
>
> However I have reduced the size of the images, and tried to attach it
> (100kb is the limit), so that's why the aim what I'm writing can not seen.
>
>    1. Coin_original.jpg --> The original image
>    2. After_global_matting.jpg --> The image after Global matting. If You
>    can see when I select only the coin, GIMP copied some other points and when
>    I press crtl+shift+v It can see that not outside of the edge of the image
>    there is some other points (not fully white)
>    3. After_Global_and_Levin_matting.jpg --> the outside points of the
>    edges are deleted, which is perfect, but the colour of the edge is totally
>    wrong (not same as the original was, because of the selection of global
>    matting).
>
> So this is my problem. In the old GIMP this was better..
>
> I have thousands of photos and (and continuously will have) if the
> background change process takes more time than a minute / image then I need
> to change to someone else.
> Thank you for Your help in advance.
>
> Zoltan
>
> Zoltán Kluik <numizmatikakz gmail com> ezt írta (időpont: 2021. márc.
> 25., Cs, 17:24):
>
> > Dear Liam,
> >
> > Yes, the image is in RGB colour 8 bit.
> > What does it mean?
> > "to use select -> grow by 1 oe 2  pixels and then select shrink to remove
> > small unselected dots."  Please explain it.
> >
> > However I have reduced the size of the images, and tried to attach it. I
> > hope the system can accept it.
> >
> >    1. Coin_original.jpg --> The original image
> >    2. After_global_matting.jpg --> The image after Global matting. If
> >    You can see when I select only the coin, GIMP copied some other points and
> >    when I press crtl+shift+v It can see that not outside of the edge of the
> >    image there is some other points (not fully white)
> >    3. After_Global_and_Levin_matting.jpg --> the outside points of the
> >    edges are deleted, which is perfect, but the colour of the edge is totally
> >    wrong (not same as the original was, because of the selection of global
> >    matting).
> >
> > So this is my problem. In the old GIMP this was better..
> >
> > I have thousands of photos and (and continuously will have) if the
> > background change process takes more time than a minute / image then I need
> > to change to someone else.
> > Thank you for Your help in advance.
> >
> > Zoltan
> >
> >
> > Liam R E Quin <liam holoweb net> ezt írta (időpont: 2021. márc. 25., Cs,
> > 14:35):
> >
> > > On Wed, 2021-03-24 at 00:15 +0100, Zoltán Kluik via gimp-user-list
> > > wrote:
> > > > . Now in 2.10.22 I open a picture, using foreground
> > > > selection tool, but in this version there is a motor feature where I
> > > > can
> > > > select Global- and Levin matting. I use both with iteration value 1.
> > > > First
> > > > Global is selected, coin is rounded, pressing enter, selecting the
> > > > foreground with the mouse, again pressing enter. Here the problem is
> > > > that
> > > > under the coin where the green background’s colour was a little bit
> > > > darker
> > > > there are green dots.
> > >
> > > One approach is  to use select->grow by 1 oe 2  pixels and then select-
> > > > shrink, to remove small  unselected dots.
> > >
> > > Is your image in 8-bit colour RGB mode? The title bar of GIMP will tell
> > > you.
> > >
> > > Without a sample image it's hard to tell  what's going on exactly. I
> > > take it you are running Linux under GNOME 3 and have 32GBytes of RAM?
> > >
> > > Liam
> > >
> > >
> > >
> > > --
> > > Liam Quin - web slave for https://www.fromoldbooks.org/
> > > IRC::ankh in full-time voluntary servitude