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Migrating selected area

Oct 14, 2013, 15:49
Post: #1
Migrating selected area
The other day I accidentally hit a keystroke combination that produced an effect I was surprised and happy to see. I have not been able to reproduce it.

I had a layer that was smaller than the layer below it, those being the only two layers. And somehow I was able to select the size of the top layer down onto the lower layer in a way that I could move around to position.

I've always looked for a way to do that, but I've never known how. Anybody know?
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Oct 14, 2013, 19:09 (This post was last modified: Oct 14, 2013 19:10 by foxmuldr.)
Post: #2
RE: Migrating selected area
(Oct 14, 2013 17:37)ofnuts Wrote:  I could move around to position -> move what?

The selected area on the lower layer -- like when you select with the rectangle tool and then can move the selected layer around to position it before doing something with it.

Whatever keystroke I used, the rectangle area was selected on the bottom layer, and it was off to the left side of the smaller/upper layer's location, and it was able to be moved around. Kind of freaked me out actually, and then I realized what was going on. I don't know what I did to get it there though. I was trying something with Ctrl+H or Ctrl+Shift+J. Can't remember.
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Oct 14, 2013, 22:36
Post: #3
RE: Migrating selected area
(Oct 14, 2013 19:50)ofnuts Wrote:  When you have a selection, Alt-shift-drag (in that order) copies and moves the selection, mask, and while Alt-Ctrl-drag (in that order) cuts and moves it.

The area I was able to move was the selected rectangle, yet without copying or cutting. It was the selected rectangle itself that was being moved, so as to then act on the content beneath it once later positioned and accepted.

I have looked for it today, but cannot find it. If I come across it again, I'll post.
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Oct 15, 2013, 13:43
Post: #4
RE: Migrating selected area
(Oct 15, 2013 00:10)ofnuts Wrote:  There is always implicitly a cut or copy. If you don't get a hole in the source layer, it's a copy, otherwise, it's a cut. The thing you move becomes a "floating selection" (check the layers list).

If you go into GIMP and choose File -> New, and create a 640x400 image, for example. And then click the rectangle select tool. And then go into the image somewhere and mark off a rectangle (100x100, for example). You can grab in the middle of that rectangle and drag it around to position it. You can also grab hold of the selection area edges and resize. This allows you to position the selected area before you begin a copy or paste operation.

That's what it did.

It was the exact size of the other layer, but was in a mobile state like that on the layer below, where I could grab hold of it and move it around. It did not have the resizable edges, however.

Make sense? :-)
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Oct 15, 2013, 16:12 (This post was last modified: Oct 15, 2013 16:14 by foxmuldr.)
Post: #5
RE: Migrating selected area
(Oct 15, 2013 14:30)ofnuts Wrote:  So, yes, you created a rectangle selection, and then moved it with Alt-shift -drag...

Exactly! Except I didn't use Alt or shift, just a left-click drag. No copy or cut operations, just repositioning the rectangle region.

The part I'm not understanding is how I got a rectangle region of the size of the layer above onto the layer below, and was able to move it that way with just using the left-click drag.
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