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Correct a free selection after finishing

Apr 27, 2011, 00:52
Post: #1
Correct a free selection after finishing
I spent 1 hour looking for this in Google and none of the links provided me an answer. Sorry to spoil here but this is really a basic question.

I made a free selection in a photo with a great detail of zoon which took me a lot of time. When I pasted it I noticed that there is a small incorrection that I wanted to retouch.

However the original cut picture has the borders of the selected area brightening but doesn't show any longer the points that I could correct.

Any way of forcing it to edit, allowing me to change slightly the borders ?

Thanks
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Apr 27, 2011, 06:49
Post: #2
RE: Correct a free selection after finishing
(Apr 27, 2011 00:52)AutoPic Wrote:  I made a free selection in a photo with a great detail of zoon which took me a lot of time. When I pasted it I noticed that there is a small incorrection that I wanted to retouch.

However the original cut picture has the borders of the selected area brightening but doesn't show any longer the points that I could correct
I don't quite get it. Do you mean that you find pixels that are actualy different between source and target?

(Apr 27, 2011 00:52)AutoPic Wrote:  Any way of forcing it to edit, allowing me to change slightly the borders ?
<Short in the dark>You may have Gimp in a mode where editing is limited. Do you have a selection active (try Select>None)? In the Layers dialog (Ctrl-L) do you have a floating selection? If you save as XCF and reopen, do you stil have the problem?</shot in the dark>

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Apr 27, 2011, 07:43
Post: #3
RE: Correct a free selection after finishing
Sorry if it was not clear.

In a photo with several persons, I zoomed and used the Free Select Tool to cut around one of those persons. Idea was to copy it to another document.

That free selection was almost perfect, however I missed part of the hair.

During the free selection we are able to correct and adjust the points (do you understand what I mean ?) . However as soon as we connect the last point with the first, the selection becomes completed and I can't adjust the selection any longer. That's what I wanted to know.
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Apr 27, 2011, 08:29
Post: #4
RE: Correct a free selection after finishing
Ah, OK.

yes, it can be done, you just combine it with another selection that includes the additional pixels(*). If you still have the previous selection (you can likely recover it by doing alpha-to-selection on the cutout layer), do a "Select>Save to channel" to save it. A good idea is to open the Channels dialog at that point and put a descriptive name on the saved selection.

Then select your additional pixels (actual tool is unimportant). You can include in that selection part of the person already in the previous selection. Also "Select>Save to channel".

The in the "Channels" dialog: right click on the original selection and use "Add to selection", thois will create a selection with the additional pixels just selected, plus the original selection. Again, "Select>Save to channel", and if you are happy with it you can delete the other two saved selections.

(*) You can also use many of the selection tools in "addition" mode by depressing the shift key, but doing the selection piece-wise, saving to channel, and combining the results as explained is a lot better even for an initial selection:
- you can work out a complicated selection during several distinct editing sessions, since the channels are also saved when you save to XCF.
- you can use different selection tools for different parts

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Apr 27, 2011, 09:56
Post: #5
RE: Correct a free selection after finishing
Thanks a million Ofnuts. That worked perfectly !

A final question. After free selecting the person I copied that into another empty image with white backgroud.

What's the easiest way now to turn the white into a different color ? Should be easy because is a picture in a simple empty white background, no ?
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Apr 27, 2011, 11:41
Post: #6
RE: Correct a free selection after finishing
Moderately effective: Magic wand on background, and bucket-fill the selection.

Right way: when you paste your selection in the new image, use "paste as new layer" or, if you use plain "paste", create a new layer (that will merge with the "floating selection"). Then if you need a selection over whatever you copied, use "Layer>Transparency>Alpha to selection" on that layer. And if you want another color for the background, make it the current layer and bucket-fill the whole of it.

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