如何在php中找到更轻或更暗版本的十六进制代码的十六进制代码

I'm trying to achieve what this guy here is doing, only in PHP or jQuery. Basically I have a hex color code, say #FF0000, which is red. How would I find darker or lighter hex color codes of this color.

我试图通过PHP或jQuery来实现这个人在做什么。基本上我有一个十六进制颜色代码，比如＃FF0000，它是红色的。如何找到这种颜色的深色或浅色十六进制颜色代码。

To clearify: I want to take a hex color code (#FF0000), and find the correct hex color code of lighter or darker shades of that color code.

要清除：我想采用十六进制颜色代码（＃FF0000），并找到该颜色代码更浅或更深色调的正确十六进制颜色代码。

Either done in PHP, or jQuery, something that I can change the color via PHP, as the server processes the page.

可以用PHP或jQuery完成，我可以通过PHP改变颜色，因为服务器处理页面。

I prefer not to use third party jQuery plugins to achieve this, but I will if its super duper complicated.

我不想使用第三方jQuery插件来实现这一点，但是如果它超级复杂的话，我会这样做。

3 个解决方案

#1

When you say "a lighter version" (or "a darker version") there are a very large number of possibilities. For instance, you could take #ff0000 and have 253 "darker versions" ranging from #010000 to #fe0000. Similarly, you can have 253 "lighter versions" ranging from #ff0101 to #fffefe. So your question is not very well defined.

当你说“更轻的版本”（或“更黑的版本”）时，有很多可能性。例如，您可以使用＃ff0000并拥有253个“较暗版本”，范围从＃010000到＃fe0000。同样，你可以拥有253个“更轻的版本”，范围从＃ff0101到#fffefe。所以你的问题定义不明确。

I will assume in this answer that by "lighter version", you mean the result of overying a 50% transparent white on the colour, and by "darker" the same but black.

我将在这个答案中假设，“较轻的版本”，你的意思是在颜色上涂上50％透明白色的结果，而在颜色上涂上“深色”的结果，但是黑色。

In any case, you should always start by extracting the numbers from the hex code:

无论如何，您应该始终从十六进制代码中提取数字：

// assuming input of form "#RRGGBB"
$col = Array(
    hexdec(substr($input,1,2)),
    hexdec(substr($input,3,2)),
    hexdec(substr($input,5,2))
);

Now that you have that, you can easily apply the "overlay":

现在您已经拥有了它，您可以轻松应用“叠加层”：

$darker = Array(
    $col[0]/2,
    $col[1]/2,
    $col[2]/2
);
$lighter = Array(
    255-(255-$col[0])/2,
    255-(255-$col[1])/2,
    255-(255-$col[2])/2
);

Then it's a simple matter to convert them back into hex codes:

然后将它们转换回十六进制代码是一件简单的事情：

$darker = "#".sprintf("%02X%02X%02X", $darker[0], $darker[1], $darker[2]);
$lighter = "#".sprintf("%02X%02X%02X", $lighter[0], $lighter[1], $lighter[2]);

Done!

完成！

3 个解决方案

#1

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