Inspired by this fellow blogger and artist:
A link to a video about how to do it correctly: Four ways to do multi-colored stencils.
First stencil, step 3, stick it on (step 1 was getting a photo, turning it into black and white and increasing the contrast (see http://www.youtube.com/watch?v=SpcU0b_okv4) and printing, step 2 was cutting it out with an Exacto knife.)
Step 4. (Should be mowing this grass!)
Failure. Bleeding from overspray.
Step 3 again, this time using this cool wax you can get at the office supply (note the original stencil is black now):
The cool waxy stuff:
Step 4 again, this time with tempera paint:
Step 5, remove stencil, discover step 4 failure. Also ruined stencil.
Research how to do it completely with GIMP.
It didn’t work out exactly as described so here is documentation of the additional steps:
Thankfully have a photo of the spray-painted stencil, which is black now, and start with that. Make it a stencil using GIMP as described in completely with GIMP.
Thinking… Can I flip black and white? Should be simple. There’s something called Invert. Click. Nothing happens.
Struggle and experiment, use handy Select by Color (Tools->Selection Tools->Select by Color) to grab all the black.
Have dotted lines. Look in the Select menu. Find Float! Try that. (Note: This screen shot made by creating a new image, then File->Screenshot, selected The Whole Screen, then crop the result.)
It’s floating. Can it be dragged free of that background? Yes.
Now what? Click Edit->Copy. Now it’s in the clipboard.
Now create a new image, (1000×750, basic working size) and paste. Notice, probably didn’t have to move it off to the side as that actually had no effect. Just making it float was the key to detaching it from the background and copying it into the clipboard.
It’s still floating. Can I invert it now? No. Instead, Tools->Selection Tools->Select by Color and click on the white part. Now white part is selected; you can’t tell, because the borders that are highlighted = borders of black, but it really is the white part, which you can tell when you do this: Edit->Fill with Pattern:
Do Tools->Selection Tools->Select by Colors again and click on the black part. Does Invert work now? No. That would be too easy. How about Edit->Fill with Background Color? Expecting the vinyl paneling in the stencil, get this instead, the whole point of the entire stenciling exercise!
Okay, can it be less white? Yes, but can’t remember how to make it gray. Did that somehow. (Will update this post when it’s re-discovered.)
However, can now just Control C or Edit->Copy the floating image, open the background (purchased from canstockphoto for $3) and paste from the clipboard. The image is still floating. Drag it to where you want it.
Last step, anchor it. Could this be easy? Of course not. Go to Windows->Dockable Dialogs->Layers. Find the layer in the box to the right. First adjust the opacity down so it’s kind of transparent. Then, at the bottom of that dialog box, find the little anchor symbol and click it. Sometimes. Little anchor symbol was no longer there when this was written but it was there the first time. No hallucination… really, just had coffee. Whew, anchor also exists under the Layer menu.
Hint: If you accidentally lose the ability to move your floating level, go to Tools->Transform Tools->Move. That puts you back in move mode.
Conclusion: Since the spray painted stencil was less of a disaster than the tempera paint, sangria is better for art work than coffee.