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How to make 'selected area' Transparent?

Aug 12, 2011, 02:45
Post: #1
How to make 'selected area' Transparent?
Greetings,
I have a cloud.png image
and want to make the area around the cloud transparent.
So i used the 'select by color tool'
and now i want to fill the selected area with TRANSPARENT.
But the 'bucket fill' doesn't allow for that.
Pls, what can i use.
Thanks...vmars316
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Aug 12, 2011, 06:36
Post: #2
RE: How to make 'selected area' Transparent?
1) Make sure your layer can be transparent: Layer/Transparency/Add alpha channel (if it's grayed you already have one). The alpha channel is the "transparent" color.

2) Just "delete" the selection. Without using a selection, you can also use the eraser.

And see http://gimpforums.com/thread-how-to-eraser-tool Smile (if you didn't understand something there, or the answer isn't enough, continue asking in the same thread...)

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Aug 12, 2011, 19:35 (This post was last modified: Aug 12, 2011 19:37 by vmars316.)
Post: #3
RE: How to make 'selected area' Transparent?
Thanks,
I see whats happening:
gimp gets hung up, and doesnt respond to commands.
And then sometimes it crashes.

Normally, to cause selection to become transparent,
I 'select by color' then edit/clear.
And sometimes I have to throw in an 'select/invert'.

And then there are those unpredictable times when the
command just doesnt take. And if i dont notice it,
and try it again, and again. Gimp gets bogged down and won't even SAVE the File.
The only way out of this situation is to Exit the pgm.

?? After a Selection: Is there a visible indicaton of what will actually get copied
on a 'copy visible' command ??
I never seem to know what will actually get copied.
The only way, so far, is to 'copy visable' and 'paste to see'.
If results arent what i want, then i do a 'Select.Invert'.
Is there a better way?

But I must say that when it works,
your 'select by color' is a GREAT gadget.
Thanks...vmars
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Aug 12, 2011, 20:32
Post: #4
RE: How to make 'selected area' Transparent?
(Aug 12, 2011 19:35)vmars316 Wrote:  Thanks,
I see whats happening:
gimp gets hung up, and doesnt respond to commands.
And then sometimes it crashes.
I've been using Gimp quite intensively, and I give it a very good shake with scripts I write run amok, and I have never seen it crash. When Gimp doesn't respond to commands, check that it is in a state that accepts these commands: use the image menu bar, locale the same command and see if it is grayed. for instance, after a paste, your pasting is a "floating selection" and while it it hasn't been converted to something more permanent the paint tools are disabled.
(Aug 12, 2011 19:35)vmars316 Wrote:  Narmally, to cause selection to become transparent,
I 'select by color' then edit/clear.
And sometimes I have to throw in an 'select/invert'.
This works regardless of the selection method. Be aware that selection by color does "partial selection" on colors that are close to the threshold. Partial selection means "partial delete" (ie, these are do not become completely transparent).
(Aug 12, 2011 19:35)vmars316 Wrote:  And then there are those unpredictable times when the
command just doesnt take. And if i dont notice it,
and try it again, and again. Gimp gets bogged down and won't even SAVE the File.
The only way out of this situation is to Exit the pgm.
See above.
(Aug 12, 2011 19:35)vmars316 Wrote:  ?? After a Selection: Is there a visible indicaton of what will actually get copied
on a 'copy visible' command ??
I never seem to know what will actually get copied.
The only way, so far, is to 'copy visable' and 'paste to see'.
If results arent what i want, then i do a 'Select.Invert'.
Is there a better way?
If you have the "marching ants" display the copied area is fairly easy to guess. In case of partial selection, the "marching ants" are where the selection level is 128. A better way to better evaluate the selection is the "quickmask" mode (click dotted square at the bottom left of your image). If you need a very specific selection you can even paint the selection on it.
(Aug 12, 2011 19:35)vmars316 Wrote:  But I must say that when it works,
your 'select by color' is a GREAT gadget.
It's not bad but I seldom use the selection from it directly

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Aug 13, 2011, 04:16
Post: #5
RE: How to make 'selected area' Transparent?

Quote: and I have never seen it crash.

I can only report what i experience.
Quote: A better way to better evaluate the selection is the "quickmask" mode
(click dotted square at the bottom left of your image).

I don't see "dotted square at the bottom left of image"
Quote: If you need a very specific selection you can even paint the selection on it.

Hmm... sounds interesting.
Thanks...vmars
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Aug 13, 2011, 09:21 (This post was last modified: Aug 13, 2011 09:21 by ofnuts.)
Post: #6
RE: How to make 'selected area' Transparent?
(Aug 13, 2011 04:16)vmars316 Wrote:  I don't see "dotted square at the bottom left of image"
http://www.gimp.org/tutorials/Quickmask/

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Aug 15, 2011, 00:18
Post: #7
RE: How to make 'selected area' Transparent?
Ah, there you are!
Thanks...vmars
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