unicode - Unicode 标准中的颜色？

Question

Unicode 6.0 添加了几个带有描述的字符，表明这些字符应该以特定颜色呈现:

红苹果 U+1F34E

青苹果 U+1F34F

蓝心U+1F499

绿心U+1F49A

黄心U+1F49B

紫心U+1F49C

绿皮书U+1F4D7

蓝皮书 U+1F4D8

橙皮书 U+1F4D9

大红圈 U+1F534

大蓝圈 U+1F535

大号橙色钻石 U+1F536

大号蓝钻 U+1F537

小橙钻 U+1F538

小蓝钻 U+1F539

上指红色三角形 U+1F53A

下指红色三角形 U+1F53B

上指小红三角U+1F53C

下置小红三角U+1F53D

我原以为字体符号总是灰度的。

unicode 作者是否预见到这些可能会以不同的颜色呈现？
在 unicode.org 官方 PDF ( http://www.unicode.org/charts/PDF/U1F300.pdf ) 中，这些仅被描述为具有不同类型的剖面线。

当前是否有任何机制允许特定字符以特定颜色呈现，仅基于其代码点，而不是任何其他富文本格式？ (例如，TrueType 或 OpenType 字体文件中的颜色属性)

Answer 1

来自 Unicode FAQ: Emoji and Dingbats ，加粗我的:

Q: What about characters whose name specifies a color?

A: Some of the characters from the core emoji sets have names that include a color term, for example, BLUE HEART or ORANGE BOOK. These color terms in the names do not imply any requirement about how a character must be presented; they are intended only to help identify the corresponding character in the core emoji sets. Even names of symbols such as BLACK MEDIUM SQUARE or WHITE MEDIUM SQUARE are not meant to indicate that the corresponding character must be presented in black or white, respectively; rather, the use of black and white is generally just to contrast filled versus outline shapes, or a darker color fill versus a lighter color fill. [PE]

关于 mailing lists 的争论颇多。当时关于这些是否应该用颜色命名，或者不引用颜色的通用名称，以及这是否开创了一个不好的先例。 Emoji Symbols: Background Data包括“旧名称”，例如 APPLE-1 而不是 RED APPLE 和 BOOK-3 而不是 ORANGE BOOK。

最终的名字使用这个原则:

Symbols with an inherent color shall bear this color in their name unless the entity denoted by the name has identifies the color anyway (e.g., a BANANA is uniquely yellow and therefore does not need to be called YELLOW BANANA, while a RED APPLE must be named so as there are also green apples).