Sometimes it happens that I would like to extract a person from a photo and remove the background. How can I do it with GIMP? Every attempt that I made gave me very bad results.
Can you give me some steps to follow?
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With most things in Gimp and Photoshop, it comes down to using the selection tools. The better you get at using selections, the easier time you have removing/extracting elements from the background.
This is a pretty good step by step article on how to use the selection, masks, and feather tools to get a good selection around your subject.
Removing backgrounds in a photo that wasn't specifically shot for the isolation is usually a very complex process. There are many completely different techniques to isolate details, all depending on the subject itself. One thing is to isolate evey single hair of a lady against a forrest background, another is to isolate a sharp car on a blurry road.
See The Russel Brown Show, he's one of the Adobe Photoshop team members, he's got a lot of free video tutorials on different background isolation techniques.
Many of these techniques can be fully implemented using Gimp.
I am not Gimp guru. There is a simple trick I learned which helped me a few times.
(warning: this only works with images with the more or less same background color distinct from colors of the subject)