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Methods for removing backgrounds from images

#1 User is offline   XyllyX 

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Posted 24 July 2006 - 01:10 PM

These 3 threads explain different ways of removing the background from an image.

The Paths Method - by fencepost

The Quickmask Method - by swmiller6

The Layer Mask Method - by Clayogre
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#2 User is offline   PhotoComix 

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Posted 24 July 2006 - 06:12 PM

If the background has a solid color, that is not present in the rest of image you can also use "color to alpha"
(from image menu\layer\transparence.
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#3 User is offline   JeppebirD 

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Posted 31 July 2006 - 03:13 PM

If it is present in the image,
Can't you just:

1[*]Use the 'color selection' tool on the background,
2[*]Toggle Quickmask on
3[*]Use the eraser to erase the parts in the picture
4[*]Toggle Quickmask off
4½[*]Feather the selection
5[*]Press ctrl+k until it's good
Cover and duck, unless you'r rockin' with us...
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#4 User is offline   Gunther 

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Posted 01 August 2006 - 08:24 AM

Or even better...select around those areas that are the same colour, invert the selection, then run Colour to Alpha.
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#5 User is offline   KOTOR 

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Posted 08 August 2006 - 09:48 PM

okay i just removed the background, and all the paths are closed for the rendering of the image. how do i put in a background without getting rid of my image?

p.s. im very new at this.
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#6 User is offline   XyllyX 

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Posted 09 August 2006 - 12:41 PM

You need to learn about layers.

Go here.
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#7 User is offline   for-aken 

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Posted 30 August 2006 - 02:55 PM

hey i have render cut but how do i keep gimp from putting a white bg on it cuz that just makes it dumb cuz the bg comes back i tryed saving as xcf but then image hoster wont host it
**currentt**
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#8 User is offline   XyllyX 

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Posted 31 August 2006 - 10:04 PM

That's because you didn't put an alpha channel on the layer you cut the render out of. Do Layer>Transparency>Add Alpha Channel. Or right click on the layer and do the same thing. You can also do it by duplicating the layer and deleting the background layer. An alpha channel is what allows for transparency. The first layer in a Gimp image, by default, does not have an alpha channel.
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#9 User is offline   for-aken 

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Posted 01 September 2006 - 06:59 PM

ok so i cut the background out then do layer->alpha to channel thats all
**currentt**
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#10 User is offline   XyllyX 

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Posted 01 September 2006 - 07:16 PM

Actually, you would probably wanna add the alpha channel before you do the cut. Then do your cut. Then, when you paste, your background will be transparent.
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#11 User is offline   benzboi92 

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Posted 11 September 2006 - 10:26 PM

what do u guys think about the siox foreground extraction tool?
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#12 User is offline   PhotoComix 

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Posted 13 September 2006 - 04:20 AM

As plugin is just a proof of concept
As features (as in the last 2.3.x dev release of gimp ) it seem quite interesting...still often details have to be manually polished...
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#13 User is offline   sir hobo 

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Posted 24 September 2006 - 08:52 PM

thanks i needed that help i was eraseing the whole thing myself ,lol.
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#14 User is offline   cowdude 

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Posted 27 September 2006 - 01:05 AM

I was about to ask that lol.
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#15 User is offline   cowdude 

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Posted 27 September 2006 - 01:15 AM

6.) Once you have finished making your selection toggle the quickmask off and do a copy paste as new.
7.) Now to really clean up your selection do
>alpha to selection
>selection shrink 1px
>selection invert
>feather selection 1px
>cntrl k



How do you do those?
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#16 User is offline   nu2this 

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Posted 09 December 2006 - 12:50 AM

Hello,

I just downloaded the gimp so I am a total newbi.

I have been able to outline the section I want to isolate, toggled the quickmask off and my image is now surrounded "by moving ants". In your tutorial you say to:

6.) Once you have finished making your selection toggle the quickmask off and do a copy paste as new.

Can you tell me how to "do a copy paste as new"?

Thanks for any help.
:h:
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#17 User is offline   Fatal Edge 

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Posted 09 December 2006 - 12:56 AM

Both options are under the Edit menu.

Edit > Copy

Edit > Paste as New

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#18 User is offline   nu2this 

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Posted 09 December 2006 - 01:03 AM

Thanks,

I must have done something wrong. I copied the image , then tried to paste it elsewhere. When it pasted, It was the original picture-------------Like I hadn't done a thing.

I'll try again :h:
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#19 User is offline   normski 

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Posted 10 December 2006 - 06:45 PM

Erm, I had a picture, well a render I was cutting out, I cut away the background, then there was white around it, so I filled it with a random purple colours since my soldier had none of that colour on it. And di that colour to alpha and it made my soldier near transparent :S, And I mean so you can hardly see him.
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#20 User is offline   Valtu 

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Posted 14 January 2007 - 08:25 PM

help! there must be better way than the lasso! i so cant do it!i hate the lasso i will never use the lasso.. -.-
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