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Cut out a piece of an image and save it

May 5, 2011, 20:14
Post: #1
Cut out a piece of an image and save it
Hi there,

I'm trying to use the crop tool to cut out the rectangular image, but I can't seem to get rid of the white border. I scanned in the image so its still showing the white paper around it, how do I get rid of this and just save the image portion? Thanks!
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May 5, 2011, 20:37
Post: #2
RE: Cut out a piece of an image and save it
The Crop tools isn't really meant to isolate something forml its bacground (the changes that it is perfectly rectangular and aligned are slim).

I think that what you want to do is more like this: http://gimpforums.com/thread-changing-a-...parent-png

with possibly:

before: a bit of Level or Curves to change the almost-white of the scan to pure white
after: a crop to get rid of the useless pixels

If not, attach the image here (or part of it).

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May 5, 2011, 22:40
Post: #3
RE: Cut out a piece of an image and save it
I'm wondering if there is a very simple way to 'cut' out a piece and save it by itself. My co-worker was showing me how you can use the Mac OSX default picture editor and just crop a piece and save it all alone, I think. Can we do that in this case?
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May 5, 2011, 23:03
Post: #4
RE: Cut out a piece of an image and save it
Yes... define a selection around your piece using the selection tools, and invert it (so it covers the rest of the image) and erase. The hard part (from moderately hard to very hard (loose hairs)) is to define the selection to obtain a proper cut. This is fairly image dependent (photographs and line-art, for instance, would require very different techniques).

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May 6, 2011, 17:03
Post: #5
RE: Cut out a piece of an image and save it
(May 5, 2011 23:03)ofnuts Wrote:  Yes... define a selection around your piece using the selection tools, and invert it (so it covers the rest of the image) and erase. The hard part (from moderately hard to very hard (loose hairs)) is to define the selection to obtain a proper cut. This is fairly image dependent (photographs and line-art, for instance, would require very different techniques).

I did the selection, erased the 'white' background, but after I save, it still shows up white. How would I make the background transparent? thanks! <---- super n00b when it comes to designs progs
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May 6, 2011, 18:58
Post: #6
RE: Cut out a piece of an image and save it
Layer>Transparency>Add alpha channel

The alpha channel is what controls the transparency of a layer or image. Of course you then have to save your image in a format tat supports transparency (Gimp's native XCF format or PNG).

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May 6, 2011, 19:16
Post: #7
RE: Cut out a piece of an image and save it
Ok so I erased the background, went to layer -> transparency and added alpha channel then saved (and it asked me to export because it didnt support transparency in current format), but im still seeing the background T_T
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May 6, 2011, 22:52
Post: #8
RE: Cut out a piece of an image and save it
(May 6, 2011 19:16)bascotie Wrote:  Ok so I erased the background, went to layer -> transparency and added alpha channel then saved (and it asked me to export because it didnt support transparency in current format), but im still seeing the background T_T
Add the alpha channel *before* erasing the background. Without an alpha channel the image is fully opaque so you cannot erase the background.

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May 8, 2011, 18:30
Post: #9
RE: Cut out a piece of an image and save it
save it in PNG format you are probably using JPEG
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May 8, 2011, 18:40
Post: #10
RE: Cut out a piece of an image and save it
you are trying to do this
[Image: torqthrust-1.png]
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Jan 27, 2012, 19:04
Post: #11
RE: Cut out a piece of an image and save it
(May 8, 2011 18:40)pamopar Wrote:  you are trying to do this
[Image: torqthrust-1.png]
I'm not the OP, but, yes that is exactly what I'm trying to do. Thanks in advance
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