### 6.3. 超新星...

#### 6.3.1. 概観

図17.112 超新星フィルターの適用例

元画像

Filter applied

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. オプション

図17.113 「超新星」フィルターのオプション

Presets, 「Input Type」, Clipping, Blending Options, プレビュー, Merge filter, Split view

  | 注記
  These options are described in 「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.

半径

  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

  ここでは放射光の本数を 1 から 1024 本の範囲で設定できます。 新星の中央のいずれの画素からもこの本数の光線が 1 ピクセル幅で放たれます。 それら光線がすべて放射されれば多少なりとも重なり合いが起こり、 結果としてスライダーを操作するときにぎらぎらと輝く感じになります。

乱数色相

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

色

  この色だまりボタンをクリックするといつもの色変更ダイアログが現れ、 色が変更できます。 また「描画色/背景色」ダイアログかツールボックス底部にある色標識をクリックしてこのボタン上までドラッグして放っても色が変えられます。

  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.

乱数種, 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.

6.2. Bloom |  | 6.4. レンズフレア...

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