blocks|key|1566792|text|This+MSDN+article使用(0.299+*+color.R+%2B+0.587+*+color.G+%2B+0.114+*+color.B);|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1566793|This+Wikipedia+article使用(0.3*+color.R+%2B+0.59+*+color.G+%2B+0.11+*+color.B);|1566794|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/bb332387.aspx#tbconimagecolorizer_grayscaleconversion|1|http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale^0|J|1I|0|H|0|0|O|1D|0|M|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]]|E|$]]|$1|H|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

<a href="http://msdn.microsoft.com/en-us/library/bb332387.aspx#tbconimagecolorizer_grayscaleconversion" rel="nofollow noreferrer">This MSDN article</a> uses <code>(0.299 * color.R + 0.587 * color.G + 0.114 * color.B);</code>

<a href="http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale" rel="nofollow noreferrer">This Wikipedia article</a> uses <code>(0.3* color.R + 0.59 * color.G + 0.11 * color.B);</code>

blocks|key|1781804|text|这取决于你的动机是什么。如果您只想将任意图像转换为灰度，并使其看起来非常好，则此问题的其他答案中的转换也可以。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1781805|如果您要将彩色照片转换为黑白照片，该过程可能会非常复杂和主观，需要对每个图像进行特定的调整。要了解其中可能涉及的内容，请看这张来自Adobe+For+Photoshop的tutorial。|offset|length|1781806|在代码中复制它将是相当复杂的，并且仍然需要用户干预来获得美学上“完美”的结果图像(无论这意味着什么！)。|1781807|entityMap|0|LINK|mutability|MUTABLE|url|http://www.adobe.com/designcenter/photoshop/articles/phscs2mrblkwht.html^0|0|2D|8|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

This depends on what your motivations are. If you just want to turn an arbitrary image to grayscale and have it look pretty good, the conversions in other answers to this question will do.

If you are converting color photographs to black and white, the process can be both very complicated and subjective, requiring specific tweaking for each image. For an idea what might be involved, take a look at this <a href="http://www.adobe.com/designcenter/photoshop/articles/phscs2mrblkwht.html" rel="noreferrer">tutorial</a> from Adobe for Photoshop.

Replicating this in code would be fairly involved, and would still require user intervention to get the resulting image aesthetically "perfect" (whatever that means!).

blocks|key|1566923|text|此recent+scientific+article比较了将彩色照片转换为灰度的最先进技术，包括简单的亮度公式和更复杂的技术。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1566924|entityMap|0|LINK|mutability|MUTABLE|url|http://cadik.posvete.cz/color_to_gray_evaluation/^0|1|P|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

This <a href="http://cadik.posvete.cz/color_to_gray_evaluation/" rel="nofollow noreferrer">recent scientific article</a> compares the state-of-the-art in converting color photographs to grayscale, including the simple luminance formula and more complex techniques.

blocks|key|1566965|text|正如还提到的，从RGB三元组的灰度转换(请注意，单色图像不需要是灰度图像)取决于口味。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1566966|例如，您可以作弊，只提取蓝色分量，只需丢弃红色和绿色分量，并复制蓝色值来取而代之。另一种简单且普遍可行的解决方案是取像素的RGB三元组的平均值，并在所有三个分量中使用该值。|1566967|事实上，光是Photoshop的专业和不是很便宜的灰度/单色转换插件就有相当大的市场，这说明转换就像你想要的一样简单或复杂。|1566968|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

As mentioned also, a grayscale translation (note that monochromatic images need not to be in grayscale) from an RGB-triplet is subject to taste. 

For example, you could cheat, extract only the blue component, by simply throwing the red and green components away, and copying the blue value in their stead. Another simple and generally ok solution would be to take the average of the pixel's RGB-triplet and use that value in all three components.

The fact that there's a considerable market for professional and not-very-cheap-at-all-no-sirree grayscale/monochrome converter plugins for Photoshop alone, tells that the conversion is just as simple or complex as you wish.

How do I convert the RGB values of a pixel to a single monochrome value?

RGB to monochrome conversion

如何将像素的RGB值转换为单色值？

问RGB到单色转换
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