Gimp 2.6 User Guide - 16.20. Starburst

16.20. Starburst
	16. Alpha to Logo Filters

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Figure 16.380. Example for the “Starburst” filter

“Starburst” applied

This filter fills the active layer's alpha with a starburst gradient and adds a shadow.

It is derived from the “Starburst” script-fu (File → Create → Logos → Starburst in the image window), which creates a logo from a text.

You can use this filter to create shapes filled with the above starburst motif:

Figure 16.381. Starburst script and filter

The “Starburst” Script-Fu script

The “Starburst” filter

This filter uses four layers (three of them will be created by the filter):

Layers after applying the “Starburst” filter

The “Burst” layer contains the bursting star, created by the Supernova filter.
The active layer was named layer #2 in the example above. It has been filled with the “Crack” pattern, so the content of this layer doesn't matter. Only the active layer's alpha channel does.

Warning

The image will always be resized to the active layer's size.
The “Shadow” layer contains a drop shadow in the same shape but slightly extended size of the active layer's alpha channel.
The “Background” layer: this is a new layer filled with the Background color.

You can find this filter in the image window menu under Filters → Alpha to Logo → Starburst.

Figure 16.382. “Starburst” options

Effect size (pixels * 30): Just ignore this option. It's nonsense. (This is actually the font size option of the Starburst Script-Fu script. You can still use it to vary the offset (size) of the lower right shadow, though: “effect size” * 0.03.)
Burst color: This color will be passed to the Supernova filter as the color of the bursting star; it defaults to green. A click on the color swatch button brings up the color selector, where you can choose another color.
Background color: This is the color used to fill the “Background” layer; it defaults to white. When you click on the button, you may choose any other color in the color selector dialog.


16.19. Particle Trace		16.21. Starscape