Tutorial: Simple Glowing Outlines
Other tutorials: Drop Shadows | Simple Glossy Discs | Aqua Buttons | iText
  1. Create a new transparent image and render some text using the text tool.
    Some example text
  2. With the text layer selected, choose Layer -> Transparency -> Alpha to Selection from the right click menu, you should see 'marching ants' around your selection.
    'Marching Ants' define your selection
  3. Grow the selection by 3 pixels using Select -> Grow from the right click menu, create a new transparent layer, positioned below your text in the layer stack, and fill it with your chosen glow colour, i've opted for #fffcd3 here, using either the bucket fill tool bucket fill, or by selecting Fill with FG Colour from the edit menu.
    Coloured border
  4. Blur the glow layer by 6px using Filters -> Blur -> Gaussian blur(IIR) from the menu. To see the full effect of a light coloured blur you can fill the background layer with black for contrast. At this point you should have a glow which resembles that shown below, you can stop at this point, or follow step 5 to add an internal glow to your text.
    Text with a simple glowing outline
  5. Use alpha to selection, as in step 2, to create a selection from your text layer. Feather the selection by 8px using Select -> Feather, now ensure that the text layer is selected and that keep transparency is unchecked and use Edit -> Clear to hollow out the centre of the black area.
    Finished off with an interior glow