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mamiwmamong
 Post subject: How to remove background from image ?
PostPosted: Sun Dec 02, 2018 11:26 pm  (#1) 
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Joined: Dec 02, 2018
Posts: 4
GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User


How to remove background from image ?

I tried to remove background from image. please see edit.xcf from original.jpg.

But result are bad, how can i do for best quality


Attachments:
edit.xcf [114.82 KiB]
Downloaded 164 times
original.jpg
original.jpg [ 444.14 KiB | Viewed 4058 times ]
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Wallace
 Post subject: Re: How to remove background from image ?
PostPosted: Mon Dec 03, 2018 12:13 am  (#2) 
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Joined: Aug 10, 2012
Posts: 13080
Location: Native to NYC living in Arizona, Gimp 2.8 & 2.10, Win 11 PC.
mamiwmamong wrote:
GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User


How to remove background from image ?

I tried to remove background from image. please see edit.xcf from original.jpg.

But result are bad, how can i do for best quality

Here are the speech bubbles in PNG format,
with a transparent background.
Attachment:
original_by wallace.png
original_by wallace.png [ 1.86 MiB | Viewed 4051 times ]

I first did a Alpha to Color, on the image.
To removed all the white pixels form it.
I then used the magic wand to select the outer portion,
where the white background was.
Inverted the selection.
Added a new later below it.
Filled the inverted selection with white,
to replace the white pixels that were remover for the colored areas.
The result of this,
is in the attached PNG file above.

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Tas_mania
 Post subject: Re: How to remove background from image ?
PostPosted: Mon Dec 03, 2018 12:37 am  (#3) 
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GimpChat Member
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Joined: Nov 04, 2015
Posts: 1366
Welcome to Gimp Chat.
To remove background color right-click the layer in the layers box and 'add alpha channel'. Then 'Select' > 'By Color'. Next left-click the color you want to remove and 'Edit' > 'Clear'. Then 'Select' > 'None'.
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ofnuts
 Post subject: Re: How to remove background from image ?
PostPosted: Tue Dec 04, 2018 7:40 am  (#4) 
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Script Coder
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Joined: Oct 25, 2010
Posts: 4758
Usual technique:

- Color select the white, with a threshold which is as small as possible but still gets most of the "white" pixels along edgse (the picture being a jpeg, the edges are a bit damaged by compression artefacts, on a clean PNG, a threshold of 0 would be enough). On this picture, a threshold of 8 seems to do it.
- Select>Grow by 2 pixels, so that selection bleeds over the edges
- Color>Color to alpha and remove the white.

Attachment:
Bubbles.png
Bubbles.png [ 302.23 KiB | Viewed 3991 times ]

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RichardD
 Post subject: Re: How to remove background from image ?
PostPosted: Thu Dec 06, 2018 2:04 am  (#5) 
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GimpChat Member

Joined: Dec 05, 2018
Posts: 5
Thanks for advice!
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