With PNG-compressed images, you do not provide the mask at all; the mask is derived from the alpha channel on the fly.
用了PNG格式的图像，你不再需要提供mask了。 mask自然而然的由PNG的透明通道提供。
Google also mentioned they work on adding alpha channel support, more speed improvements and a complete metadata specification.
Google提及他们正在着手增加Alpha通道支持，进一步提升速度，以及加入完整的元数据规范。
After the information is embedded in the image, the resulting data is output as a PNG file, with alpha channel information used to carry the data.
在图片中嵌入信息后，得到的数据可以输出为一个PNG文件，使用alpha通道信息来携带数据。
Then I setup an alpha channel to mix both using a noise shader.
然后我建立一个alpha通道，用noiseshader将两种材质混合。
The alpha channel of this texture is used as a mask that determines how bright the light is at different places.
这个纹理的阿尔法(alpha)通道作为一个遮罩，使光线在不同的地方有不同的亮度。
In general, trade software also allows for defining certain transition color range. For pixel within the range, its Alpha Channel is set between 0 and 1, i. e., translucent.
专业软件一般还允许设定一定的过渡颜色范围，在这个范围之内的像素，其Alpha通道设为0到1之间，即半透明。
In general, trade software also allows for defining certain transition color range. For pixel within the range, its Alpha Channel is set between 0 and 1, i. e., translucent.
专业软件一般还允许设定一定的过渡颜色范围，在这个范围之内的像素，其Alpha通道设为0到1之间，即半透明。
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