6.2. Supernova

6.2.1. Översikt

Figur 17.103. Applying example for the Supernova filter

Applying example for the Supernova filter

Ursprunglig bild

Applying example for the Supernova filter

Filter Supernova applied


This filter creates a big star reminding a super-nova. It works with RGB and GRAY images. Light effect decreases according to 1/r where r is the distance from star center.

6.2.2. Aktivera filtret

This filter is found in the image window menu under FiltersLight and ShadowSupernova….

6.2.3. Alternativ

Figur 17.104. Supernova filter options

”Supernova” filter options

Presets, Preview, Split view
[Notera] Notera

Dessa alternativ beskrivs i Avsnitt 2, ”Gemensamma funktioner”.

Center X, Center Y

You can use input boxes to set horizontal (X) and vertical (Y) coordinates of Supernova center. You can also click and drag the supernova center in preview.

Radie

This is radius of the Supernova center: the upper limit seems to be unlimited. When you increase the value, you increase the number of central white pixels according to r*r (1, 4, 9...).

Radius is represented by a horizontal line in preview, with a cross at end. You can click and drag this cross to set radius.

Number of spokes

This is number of rays (1-1024). Each pixel in the nova center emit one pixel wide rays. All these rays are more or less superimposed resulting in this glittering effect you get when you move this slider.

Random hue

Color rays at random. (0-360) value seems to be a range in HSV color circle.

Färg

When you click on the color swatch, you bring up the usual color selector.

You also have a color picker. When it is selected, the mouse pointer goes with a square on image: it's the color sample whose size you can modify in the GEGL operation window under Toolbox.

Random seed

Filter effect is made at random. You can change seed.