This should usually be black and white map with little color variations to avoid drastic transitions.
这经常用带有颜色变化的黑白贴图，避免转变过快。
Converting a black and white image can be done in Photoshop using the Nvidia Photoshop plugin, this allows you to paint a black and white image and encode it into a normal map.
转换一张黑白图像可以通过在PS中使用Nvidia的PS插件来实现，这允许你绘制一行黑白图像并将其编码为一张法线贴图。
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