在选择笔刷工具，用里面的大涂抹碳笔，在图片中对人物以外的区域进行涂抹，颜色用深一些的颜色，用以降低色差。

Brush Tool option a brush type named Chalk and start applying it on a new layer ( Layer ?Mew Layer ), selecting a darker color that we'll use on the whole background.

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接下来，设计高光谱成像仪的准直镜和成像镜，通过更换玻璃，降低二级光谱色差。

Secondly, the eyepiece and the Fourier transform lens are designed to minimize the secondary color by the ways of changing glass.

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