1, Alpha mask is actually a "clear channel", the display can be clearly transparent and opaque layer.
In the layer, the black represents no white representatives
2, may be provided Alpha channel (mask) the following three layers:
A. Type Layer
B. Psd file
C. With mask layers
3, the track in the mask
. A use "the Alpha on a mask layer" means: the last place by opaque layers for this layer to achieve the present mask layer.
For example, I have a beautiful piece of fabric (lower layer), and the naked body (upper layer), I can mask the body through Alpha, making fabric showing a desired body style (the more one-sided understanding but also some truth, only for reference).
. B using the "brightness on a mask layer" is meant: the luminance on a layer, this layer transparency to show layers.
For example, the color of the upper layer is "one white blue", the lower layer is a picture, when the lower layer using the "brightness on a mask layer," the image becomes: upper part fully rendered the bottom half translucent state.
Since in the layer, it is substantial opaque white, black blank transparent, to automatically adjust the color of the rest of the transparency of the lower layer according to the color code.
When used as a luminance of black mask image will become transparent. (Which is understood to initially understood that reference)