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, représentant l'opacité ou la transparence si on préfère. Quand la valeur alpha en un point d'un calque est égale à zéro, ce point est complètement transparent et la couleur de l'image en ce point dépend de ce qui est sous le point.
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In GIMP, every color channel, including the alpha channel, has a range of possible values from 0 to 255; in computing terminology, a depth of 8 bits. Some digital cameras can produce image files with a depth of 16 bits per color channel. GIMP cannot load such a file without losing resolution. In most cases the effects are too subtle to be detected by the human eye, but in some cases, mainly where there are large areas with slowly varying color gradients, the difference may be perceptible.
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In GIMP, ogni canale di colore, incluso il canale alfa, ha un campo di valori possibili tra 0 e 255: in termini tecnici si dice che ha una «profondità di colore» di 8 bit. Alcune macchine fotografiche digitali possono produrre file immagine con più di 8 bit di profondità di colore. GIMP non può caricare tali file senza perdere in risoluzione. In molti casi l'effetto è troppo esiguo da poter essere percepito dall'occhio umano, ma in alcuni casi dove ci sono larghe aree con colori che variano molto poco, la differenza può essere percettibile.
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GIMPでは、それぞれの色チャンネルおよびアルファチャンネルは 0 から 255 の範囲の値をとっています。 これはコンピュータ用語で深度 8 ビットといいます。 デジタルカメラの機種によっては色チャンネルが深度 16 ビットのファイルを生成するものもあります。 GIMPでこのようなファイルを読みこんだときは解像度が落とされます。 その場合の影響は人間の眼にはかなり微妙な違いにしか見えませんが、 場合によりとくに広い範囲を極めてゆるやかな勾配でかけられたグラデーションの見え方ではその違いがばれるかもしれません。
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In GIMP, every color channel, including the alpha channel, has a range of possible values from 0 to 255; in computing terminology, a depth of 8 bits. Some digital cameras can produce image files with a depth of 16 bits per color channel. GIMP cannot load such a file without losing resolution. In most cases the effects are too subtle to be detected by the human eye, but in some cases, mainly where there are large areas with slowly varying color gradients, the difference may be perceptible.
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I GIMP kan alle fargekanalane, inklusive alfakanalen, ha verdiar frå 0 til 255. Dette er det same som 8-bits oppløysing for dei som er inne i dataterminologien. Mange digitale kamera opererer med 16-bits oppløysing. Dette kan GIMP ikkje behandla direkte, men må omforme biletfilene til 8-bits. Ut frå teorien, skal dette gi eit dårlegare bilete, men i praksis er det stort sett uråd å sjå skilnaden. Einaste er dersom biletet inneheld store flater der fargane varierar svært lite.
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In GIMP, every color channel, including the alpha channel, has a range of possible values from 0 to 255; in computing terminology, a depth of 8 bits. Some digital cameras can produce image files with a depth of 16 bits per color channel. GIMP cannot load such a file without losing resolution. In most cases the effects are too subtle to be detected by the human eye, but in some cases, mainly where there are large areas with slowly varying color gradients, the difference may be perceptible.
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