The Lock alpha channel option is checked in the Layers dialog, the filter will have no effect.
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
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Aquestes opcions es descriuen a Secció 2, «Característiques comunes». |
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.
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Aquesta ordre no tornarà mai opacs els píxels completament transparents (valor alfa = 0). |
Figura 16.122. Exemple de Llindar alfa