Here's the picture I'm going to use.

So here goes.

Once you have the image loaded, you want to select the line draw button, which is in the Tool Palette.

Here is Tool Options.

As you can see, there are a selection of ways to Draw the white core. For the purpose of this tutorial I"ll be using the Single Line. I prefer to use point to point, which I personally find easier to use than Single Line, but I'll leave that to your own preference.

As you will notice, I have the width set to 10 this is suitable for this picture.

Keep ticks in Anti Alias, and in Create as a Vector.

You will need the tick in Create as vector, because if you don't, it will just put the line on the background, not as a separate layer.

Now comes the real fun part, putting the line in for the core.

Place the cursor at the bottom of the rod, holding the left mouse button down, drag the cursor to the top of the picture or rod, depending on which is applicable, release the mouse button.

Now the rod should look something like below.

You will need to change the Layer blend mode, from Normal to Lighten, and to make it easier to identify the layers, I renamed this layer to core.

Next, you ned to make a duplicate of this layer. You can either right click on the layer and select duplicate, or you can up up to the layers menu and select Duplicate.

The Layer Palette should look like below.

The next thing I suggest you do, is right click on the core layer, and select Convert to Rather Layer, if you don't, you won't be able to add hte Gaussian Blur. But leave the Copy of Core layer alone for the moment.

As you can see from the above image, the Copy of Core has a plus sign beside it, click on this, so it looks like below.

Select Copy of core, right click on Line, and select properties, and the below box should appear.

Click on Stroke, and select the color you wish the blade to be, then okay out of that window, and then okay out of the vector properties window.

As you look at the image, you can't see the color you wish the blade to be, If you hold the mouse cursor over the Copy of core layer, you'll be able to see the green line.

Right click on the Copy of core layer, and convert this into a Raster Layer.

I rename this layer glow, so that I can easily identify which layer has what on it.

Now, comes the best part, making the image look like a proper lightsaber.

Make sure the core layer is at the top of the layers.

So the layers Palette should look like below

This next bit I've adapted from Ryan W. video tutorial. I know this was done for Adobe Photoshop, but the end results looks just as good, well... I think so anyway.

For each layer of the glow, go up to Effect, Blur Gaussian Blur, and for the first layer put a blur on 10 on it, and the image will look like bleow

On the next layer, apply blur of 20.

And then on the next, 30.

As you'll notice, the edges of the core are a little sharp. Easy to fix. Select the Core layer, then go up to Effects, Blur, Gaussian Blur, for my pictures, I've applied a blur of 2, it's entirely up to you what level of blur you wish to apply here, and it should look like below.

Below, is how the Layers Palette should look

Then all you need to do, is right click on one of the layers in the Layers Palette, and select Merge All (Flatten), save save the image in your chosen file format.

And there you go, you have one one lightsaber glow done in Paint Shop Pro.