7.38. Alpha-Schwellwert
| 7. Das Menü »Ebene« |

### 7.38. Alpha-Schwellwert

The Threshold Alpha command converts semi-transparent areas of the active layer into completely transparent or completely opaque areas, based on a threshold you set. It only works on layers which have an alpha channel. If the Lock alpha channel option is checked in the Layers dialog, the filter will have no effect.

#### 7.38.1. Aufruf des Befehls

- You can access this command from the menubar through Layer → Transparency → Threshold Alpha....

#### 7.38.2. Beschreibung des Dialogfensters

Abbildung 16.121. The „Threshold Alpha“ filter options dialog

Presets, Input Type, Blending Options, Preview, Split view

  | Anmerkung
  These options are described in Abschnitt 2, „Gemeinsame Funktionsmerkmale“.

Wert

  The threshold alpha value determines which values will become transparent or opaque. You can set the transparency value to be used by using the slider or by entering a value between 0 and 1 in the input box. All transparency values above this threshold will become opaque and all transparency values below or equal to this threshold will become completely transparent.

  | Anmerkung
  Dieser Befehl macht vollständig transparent Pixel (Alpha = 0) auf keinen Fall deckend.

  Abbildung 16.122. Beispiel für „Alpha-Schwellwert“

  Alpha-Verlauf (Deckkkraft) von 0 bis 255
  Mit Schwellwert = 50, 127, 210.

7.37. Semi-Abflachen |  | 7.39. Auswahl aus Alphakanal

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