6.3. Supernova

6.3. Supernova
	6. Filtros de luz e sombra

6.3.1. Visão geral

Figura 17.107. Exemplo de aplicação do filtro Supernova

A imagem original

Filtro “Supernova” aplicado

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

6.3.2. Activating the Filter

This filter is found in the main menu under Filters → Light and Shadow → Supernova….

6.3.3. Opções

Figura 17.108. Opções do filtro “Supernova”

Presets, “Input Type”, Clipping, Blending Options, Pré-visualização, Merge filter, Split view

	Nota
	These options are described in Seção 2, “Common Features”.

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.

Raio

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

Este é o número de raios (1-1024). Cada pixel no centro da supernova emite raios de largura de um pixel. Todos esses raios são mais ou menos sobrepostos resultando neste efeito cintilante que você obtém ao mover este controle.

Matiz aleatório

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

Cor

Quando você clica no botão de cor, você abre o seletor de cores de costume.

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.

Semente aleatória, New Seed

This option controls the randomness of the filter. The Random seed box lets you manually enter a seed for the randomization algorithm used. You can also generate a random seed by pressing the New Seed button. If the same random seed is used in the same situation, the filter produces exactly the same results. A different random seed produces different results.