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 theThis command only works on a single layer.
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Ces options sont décrites dans Section 2, « Options communes ». |
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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Cette commande ne rendra jamais complètement transparents (valeur Alpha = 0) les pixels opaques. |
Figure 16.104. Exemple de Seuil alpha