Control Random Hue in GIMP Supernova Filter

The GEGL Supernova filter in GIMP allows you to render vibrant, radiating starburst effects directly onto your canvas. Controlling the Random hue slider within this filter dictates the color diversity of the radiating light spikes, allowing you to transition from a uniform, monochromatic flare to a multi-colored cosmic burst. This guide explains how to access the filter, adjust the Random hue parameter effectively, and control its behavior using the random seed.

Accessing the Supernova Filter

  1. Open your image or create a new layer in GIMP.
  2. Navigate to the top menu and select Filters > Light and Shadow > Supernova.
  3. Ensure the Preview box is checked so you can observe your changes in real time.

How the Random Hue Slider Works

The Random hue slider controls the degree of color variance applied across the individual spikes radiating from the center of the supernova.

  • Set to 0% (Minimum): The spikes will strictly use the single base color defined in the Color picker. Every ray matches the chosen center hue, producing a uniform, monochromatic star.
  • Low Values (1% – 20%): Introduces slight variations around your chosen base color. For example, if your base color is cyan, low values introduce subtle shifts toward light blue, green, or teal, adding depth without making the effect look chaotic.
  • Medium to High Values (21% – 100%): Expands the color range further across the entire color wheel. Setting the slider toward the maximum creates a full rainbow effect, giving individual spikes distinct, contrasting hues such as magenta, yellow, blue, and green.

Controlling Variance with the Random Seed

The Random hue slider only controls the amount of color deviation, not the specific distribution pattern. If you like the intensity of color variation but dislike where specific colors land:

  1. Locate the Random seed setting (or the New Seed button) at the bottom of the Supernova dialog.
  2. Click the button or type a different numerical seed value.
  3. Each new seed recalculates the distribution, randomly assigning the selected hue range to different spikes while maintaining the set amount of variation.