自动更改文本颜色以确保可读性 [英] Automatically change text color to assure readability
问题描述
用户可以通过接受 RGB 十六进制表示法的文本框设置按钮的背景颜色:ff00ff
、ccaa22
等,所以我需要设置文本颜色到对面.不确定术语(相反的颜色),但想法是确保可读性.
Users can set the background-color of a button through a textbox that accept RGB hexadecimal notation: ff00ff
, ccaa22
, etc. So I need to set the text color to the opposite. Not sure about the terminology (opposite color) but the idea is assure readability.
推荐答案
您可以反转背景色并将其用作前景色.以下算法产生的结果与 Photoshop 中的图像 > 调整 > 反转"颜色命令相同:
You can invert the background color and use it as foreground color. The following algorithm produces results identical to the "Image > Adjustments > Invert" color command in Photoshop:
function invertColor(hexTripletColor) {
var color = hexTripletColor;
color = color.substring(1); // remove #
color = parseInt(color, 16); // convert to integer
color = 0xFFFFFF ^ color; // invert three bytes
color = color.toString(16); // convert to hex
color = ("000000" + color).slice(-6); // pad with leading zeros
color = "#" + color; // prepend #
return color;
}
/*
* Demonstration
*/
function randomColor() {
var color;
color = Math.floor(Math.random() * 0x1000000); // integer between 0x0 and 0xFFFFFF
color = color.toString(16); // convert to hex
color = ("000000" + color).slice(-6); // pad with leading zeros
color = "#" + color; // prepend #
return color;
}
$(function() {
$(".demolist li").each(function() {
var c1 = randomColor();
var c2 = invertColor(c1);
$(this).text(c1 + " " + c2).css({
"color": c1,
"background-color": c2
});
});
});
body { font: bold medium monospace; }
.demolist { margin: 0; padding: 0; list-style-type: none; overflow: hidden; }
.demolist li { float: left; width: 5em; height: 5em; text-align: center; }
<ul class="demolist">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
请注意,这不是防弹解决方案.接近 50% 亮度和/或饱和度的颜色不会产生足够的对比度.
Note that this is not a bullet-proof solution. Colors that are close to 50% brightness and/or saturation will not produce sufficient contrast.
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