How to remove greenback ground?

Hi.
I am taking some pictures for my website. I will use green background, can someone please  list down steps how to remove greenback ground from the picture?

Thanks
AjooAliAsked:
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brundoCommented:
I am not sure if I've understood you correctly.

Does Foreground select tool (http://docs.gimp.org/en/gimp-tool-foreground-select.html) do what you want?
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AjooAliAuthor Commented:
Thanks,
Ok, Here is my question. I am taking some pictures with green background, what I wan to do is to remove the green background and have a transparent background. I
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AjooAliAuthor Commented:
I learned little bit how to do it using gimps, but the green color which I'm using is not woking. Is this the right green back ground?
IMG-0555.JPG
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brundoCommented:
Hi,

your picture is ideal for applying Foreground select tool - I've tried it :-)

What I did is:
  1. Foreground select tool (default options, a little bit playing with selecting foreground and background)
  2. shift+Q to show quick mask, then drawing on the mask with black and white color to correct some problems on the left border
  3. shift+q to come back to normal mask (what is quick mask?)
  4. Select > Feather - by 1 px
  5. Layer > Transparency > Add alpha channel
  6. Select > Invert
  7. del key
  8. Layer > New layer - I've inserted a new white layer
  9. in Layers dialog I've shifted a white layer to the bottom
  10. Image > Scale Image
  11. Select > Invert again
  12. Filters > Light and shadowDrop shadow.
But, first of all, you have to master Foreground select tool. Link to the good original documentation is in my first post.

IMG-0555-with-shadow.jpg
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JIEXACommented:
Recently, I've learned a trick of foreground object selection, that is useful for object with semi-transparent areas (when you can see some background color), like hair/wool.

1. Duplicate Background layer twice and create 2 new <b>Background copy</i> layer.
2. On the upper Background copy, get the background color with Color picker tool, and using wide brush, color the border areas of the foreground (and the background) with the picked color.
3. Set the upper Background copy's layer mix mode to <b>Difference</i>. You'll see the "halo" of the border selection.
4. Merge down the 2 Background copies (but don't merge to the original Background!).

5. Using Curves or Levels, make this "halo" (it will be further selection mask!) contrast; the irrelevant parts should be black, and relevant parts should be bright.
6. Color mix the layer to B/W. In this case 100% of red and 100% of blue are a good match.
7. Again, make this layer more contrast, and make the mandatory parts pure white, and sure-background to be black.

8. Using black brush and white pencil remove defects of the mask. Using Lasso tool select big areas of background/foreground and paint them black/white to fix defects, if any.

9. Color inner parts of the white to be white (in this case).

10. Add layer mask as Grayscale copy of layer to this layer
11. Mask to selection
12. Make the layer unvisible
13. To the original Background, add layer mask as a Selection

14. Unselect all.


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JIEXACommented:
Also, you can "somehow" create selection mask from the mix of
 +100% blue
 +100% red
 -200% green
and make it very contrast. I don't know if it is good for this case.
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AjooAliAuthor Commented:
N/a
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