See my "Graphics programming with libtiff, Part 2" article on color imaging with libtiff for more information on this topic (see the link in Resources below).
有关该主题的更多信息，请参阅我所著的关于用libtiff处理彩色图像的文章“Graphics programming with libtiff, Part 2”(请参阅下面的参考资料中的链接)。
Thus, a picture may be sad not because of its mood or color, but because its subject matter or topic is pathetic or miserable.
因此，一幅画是悲伤的，不是因为这画儿的情调或色彩，而是因为它的题材或者主题就是令人哀伤的或悲惨的。
The evolution of color vision has been a topic of intensive study for more than three decades.
色觉进化是近三十多年来广泛研究的课题。
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