Save current mask to file as a grayscale image.

保存当前蒙板为灰度图像文件。

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For a grayscale image, the bit depth quantifies how many unique shades are available.

对于灰度图像，位深度量化有多少独特的色调。

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Note that when referencing a grayscale image file, the transfer curve relating the encoded grayscale values to linear light values must be taken into account when computing the color channels.

请注意，当引用灰阶图像文件，关于编码灰阶值的线性光值的转换曲线，必须考虑到计算时的颜色通道。

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Everything's small and in low-res grayscale, and scrolling is a mess of stuttering, flickering and image ghosting.

ENGADGET: Sony Reader PRS-T2 review: same old e-reader, new and (mostly) improved design

You load your image of choice into the app, which will then remove all color from it, giving you a grayscale photo canvas.

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