颜色数也就是色彩数，就是屏幕上最多显示多少种颜色的总数。
图像的颜色数越少，文件越小。
The less colors that the image has, the smaller the file size is going to be.
请降低屏幕的分辨率和颜色数，然后重试。
Please lower your screen resolution or color depth and try again.
否则，受网络带宽的限制，一个简化的颜色数将被使用。
Otherwise, a reduced number of colors will be used, to limit the required network bandwidth.
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