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How can I smartly copy a bird?

Mar 26, 2014, 11:05 (This post was last modified: Mar 26, 2014 11:18 by DoubleG.)
Post: #1
How can I smartly copy a bird?
Hello there,

Don't know if this is a newbie question, but it feels like a newbie question. I'm an amateur stop motion animator and use Gimp for all sorts of image editing.

I have an image of a bird in full flight (wings spread) that I want to animate for a small project. I want to make 5 versions of the bird using Gimp, one with wings all spread out until a 5th version with its wings besides its body.
This I can do, no problem.

But I used a lasso function to cut the start image bird from its original picture, I could easily cut and past it over my desired background (image of my stop motion set). Only the bird with its outlines are copied over my background.
So far so good.

Now I made a bird with its wings besides it body, but when I copy this (using select square) it also copies the white surrounding background with it. How can I achieve that I can copy this new bird with only the outlines without having to use the lasso function again? Because to have to do this for 4 version of birds is a lot of work and I have the feeling it should be possible to do it simpler.

PS If it is not clear what I mean watch this old animation of me
The 'pencil sharpener' that flies in the air was added with Gimp. First the lasso function was used to cut it from the original picture and then I copied it on a number of frames while rotating it.
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Mar 26, 2014, 12:53 (This post was last modified: Mar 26, 2014 12:58 by rich2005.)
Post: #2
RE: How can I smartly copy a bird?
Copy copies whatever pixels are selected, use a rectangular selection and the white background is selected as well.

If the background is all white, one way is to turn the white into "transparent" In graphics that is an Alpha channel.
You use Colors menu -> Color to Alpha - white is the default colour, any other you have to colour pick. That gets you a layer with transparency.
Rectangular select, copy and paste into another location.

[Image: DW0RstX.jpg]

Not without snags, if there is any white in the bit you want to copy, this gets converted as well. In that case back to the magick scissors or free select tool but this time add an alpha channel to the image
Layer -> Transparency -> add Alpha Channel
Invert the selection
Cut the selection to leave the transparency. Now you can use the rectangular select tool.

** now answering questions**
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Mar 26, 2014, 13:04
Post: #3
RE: How can I smartly copy a bird?
Ok, thanks. I will try this today, so I may come back at you Smile
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