Step 1

Open the image outlines2.jpg with GIMP

Step 2

Select the blue area using the "Fuzzy Select Tool" with the option "Add to the current selection"

Step 3

Select borders of current selection
using "Border" in the "Select" menu

Step 4

Let us set the border width to 15 pixels.

Step 5

It should look like this now.

Step 6

"Quick Mask" is a GIMP-feature to have a closer inspection on selections. The selected areas will turn red.

Step 7

Use the "Paintbrush Tool" to add areas for selections. We don't want to have the effect along the borders, so add the borders of the picture to the selection.

Step 8

It looks like this now.

Step 9

Now we will use the "Gaussian Blur"

Step 10

The radius will be 50px.

Step 11

It should look like this now.

Step 12

We will disable "Quick Mask" now.

Step 13

Use the "Select by Color" tool and select the whole blue area again. The intersect option will calculate the intersection of the old selection and the current one.

Step 14

Now it looks like this.

Step 15

We will fill the selected area with color. I will select the background color white.

Step 16

And this is the result

La fin.

Thanks for watching.

Get the file yourself and try it!

 

author:	meisterluk
date:	Aug 2009
License:	Public Domain
Done with:	GIMP 2.6.6