将字符串转换为RGB颜色 [英] Hash string into RGB color

问题描述

有关如何将任意字符串散列为RGB颜色值的最佳做法吗？或更一般：到3个字节。

Is there a best practice on how to hash an arbitrary string into a RGB color value? Or to be more general: to 3 bytes.

你问：我什么时候需要这个？对我来说没关系，但想象任何GitHub上的管图网络页面。在那里你可以看到这样的：

You're asking: When will I ever need this? It doesn't matter to me, but imagine those tube graphs on any GitHub network page. There you can see something like this:

其中每个彩色线表示一个不同的git分支。对这些分支进行着色的低科技方法将是CLUT（颜色查找表）。更复杂的版本是：

Where every colored line means a distinct git branch. The low tech approach to color these branches would be a CLUT (color lookup table). The more sophisticated version would be:

$branchColor = hashStringToColor(concat($username,$branchname));

因为你每次看到分支表示时都需要一个静态颜色。对于奖励点：如何确保散列函数的均匀颜色分布？

Because you want a static color every time you see the branches representation. And for bonus points: How do you ensure an even color distribution of that hash function?

因此，我的问题的答案归结为 hashStringToColor（）。

So the answer to my question boils down to the implementation of hashStringToColor().

推荐答案

空间。这减少了如何将随机32位数转换为3字节RGB空间的问题。我看到没有什么错，只是采取低3字节。

A good hash function will provide a near uniform distribution over the key space. This reduces the question to how do I convert a random 32 bit number to a 3 byte RGB space. I see nothing wrong with just taking the low 3 bytes.

int hash = string.getHashCode();
int r = (hash & 0xFF0000) >> 16;
int g = (hash & 0x00FF00) >> 8;
int b = hash & 0x0000FF;

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