Take a picture of a tree you like. Keep the background as blank as you can, mine was a little busy and required more work to clean up in Photoshop.
I extracted the tree from the background using a couple of methods. The background blue came out easily with the "magic wand" tool, as did the house, fence etc. The biggest problem was the leafy tree as the colors were so mixed the magic wand was only picking up bits. So a combination of the eraser and magic wand finally did it. After about half an hour I had this.
I saved the file as .png although a jpg would work.
IMPORT TO INKSCAPE
You need to "trace bitmap". I found that using "edge detection" did the best job of tracing.

This is the view of what I got.
REMOVE NODES and RESHAPE
The trick now is to remove and reshape. Click on the image, select the "node tool". The one with the arrow pointing to a small square just below the select tool. You will see all of the individual nodes in the graphic. Unless you get some of them out you won't be able to "cut" the tree in SCAL and have smooth edges.
Here is what mine looked like with all the nodes.
Use the Path Simplify command to decrease the number of nodes. I did it 3 times, you might have to do less or more. If you do too much Edit Undo is your best friend. I SAVED fairly frequently so if I really messed it up I could always reload and try again. The goal is to remove all of the nodes that are clogging up the interior and will cause cutting problems in SCAL. I sculpted some of the branches by pulling nodes around to make branches split, or widen. It's fun and the results surprising. But remember UNDO and SAVE. I also go to SCAL and import the file and click preview to see how I'm doing and where I need to widen or delete some nodes. I'm not pleased with skinny little things as they tend not to cut well. Now that I look back I probably could have/should have stopped deleting and sculpting earlier and had more branches.
TEST IN SCAL
I took the file to SCAL to see how I was doing by looking in preview mode and which red lines were intersecting each other, then I cam back to Inkscape and carried on.
OUTSET
I wasn't happy still with the width of the branches so I used the path outset command to beef it up a little. All this is a matter of choice and your eye and will all depend on the tree you started with in the first place.
That's about it, it cut just fine and I have several future projects where I can make use of it. You will find the file on the SCAL forum "I made my own bare tree". http://forums.surecutsalot.com/viewtopic.php?f=9&t=2728
Thanks for taking the time to be here, I appreciate it.
MORE HELP
- Susan BLUEROBOT has a nice tutorial for how to deal with nodes. If you need a brush up see here lesson here: http://susanbluerobot.blogspot.com/2008/06/help-from-start-to-finish.html
- My lesson on tracing bitmap and breaking apart can be found in the pictorial section of this blog









