如何将颜色在RGB格式转换为十六进制格式,反之亦然?
例如,将'#0080C0'转换为(0,128,192)。
如何将颜色在RGB格式转换为十六进制格式,反之亦然?
例如,将'#0080C0'转换为(0,128,192)。
当前回答
对于直接从jQuery转换,您可以尝试:
function rgbToHex(color) {
var bg = color.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(bg[1]) + hex(bg[2]) + hex(bg[3]);
}
rgbToHex($('.col-tab-bar .col-tab span').css('color'))
其他回答
注意:rgbToHex的两个版本都期望r, g和b为整数值,所以如果你有非整数值,你需要自己做四舍五入。
下面将做RGB到十六进制的转换,并添加任何所需的零填充:
函数componentToHex(c) { var hex = c.toString(16); 返回十六进制。长度== 1 ?“0”+ hex: hex; } 函数rgbToHex(r, g, b) { 返回“#”+ componentToHex(r) + componentToHex(g) + componentToHex(b); } alert(rgbToHex(0, 51,255));/ / # 0033 ff
另一种转换方式:
函数hexToRgb(hex) { var结果= / ^ # ? (f \ d {2}) (f \ d {2}) (f \ d{2}) /美元i.exec(十六进制); 返回结果?{ r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16) }: null; } 警报(hexToRgb (# 0033 ff) .g);/ /“51”;
最后,rgbToHex()的另一个版本,正如@casablanca的回答中所讨论的,并在@cwolves的评论中建议:
函数rgbToHex(r, g, b) { 返回“#”+ (1 < < 24 | r < < 16 g | < < 8 | b) .toString (16) .slice (1); } alert(rgbToHex(0, 51,255));/ / # 0033 ff
2012年12月3日更新
下面是hexToRgb()的一个版本,它也可以解析一个简化的十六进制三元组,例如“#03F”:
function hexToRgb(hex) { // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF") var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i; hex = hex.replace(shorthandRegex, function(m, r, g, b) { return r + r + g + g + b + b; }); var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); return result ? { r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16) } : null; } alert(hexToRgb("#0033ff").g); // "51"; alert(hexToRgb("#03f").g); // "51";
我假设您指的是html风格的十六进制符号,即#rrggbb。你的代码几乎是正确的,只是顺序颠倒了。它应该是:
var decColor = red * 65536 + green * 256 + blue;
此外,使用位移位可能会让它更容易阅读:
var decColor = (red << 16) + (green << 8) + blue;
CSS Level 4边注:一般来说,你想要能够将十六进制转换为RGB的原因是alpha通道,在这种情况下,你可以很快用CSS4添加一个十六进制。例如:#FF8800FF或#f80f表示全透明的橙色。
除此之外,下面的代码在一个函数中回答了这两个问题,从另一个函数到另一个函数。这接受一个可选的alpha通道,支持字符串数组格式,解析3,4,6,7个字符的十六进制,和rgb/a完整或部分字符串(百分比定义的rgb/a值除外)没有标志。
(如果支持IE,替换少量的ES6语法)
一句话:
function rgbaHex(c,a,i){return(Array.isArray(c)||(typeof c==='string'&&/,/.test(c)))?((c=(Array.isArray(c)?c:c.replace(/[\sa-z\(\);]+/gi,'').split(',')).map(s=>parseInt(s).toString(16).replace(/^([a-z\d])$/i,'0$1'))),'#'+c[0]+c[1]+c[2]):(c=c.replace(/#/,''),c=c.length%6?c.replace(/(.)(.)(.)/,'$1$1$2$2$3$3'):c,a=parseFloat(a)||null,`rgb${a?'a':''}(${[(i=parseInt(c,16))>>16&255,i>>8&255,i&255,a].join().replace(/,$/,'')})`);}
可读版本:
function rgbaHex(c, a) {
// RGBA to Hex
if (Array.isArray(c) || (typeof c === 'string' && /,/.test(c))) {
c = Array.isArray(c) ? c : c.replace(/[\sa-z\(\);]+/gi, '').split(',');
c = c.map(s => window.parseInt(s).toString(16).replace(/^([a-z\d])$/i, '0$1'));
return '#' + c[0] + c[1] + c[2];
}
// Hex to RGBA
else {
c = c.replace(/#/, '');
c = c.length % 6 ? c.replace(/(.)(.)(.)/, '$1$1$2$2$3$3') : c;
c = window.parseInt(c, 16);
a = window.parseFloat(a) || null;
const r = (c >> 16) & 255;
const g = (c >> 08) & 255;
const b = (c >> 00) & 255;
return `rgb${a ? 'a' : ''}(${[r, g, b, a].join().replace(/,$/,'')})`;
}
}
Usages:
rgbaHex(“# a8f”)
rgbaHex(“# aa88ff”)
rgbaHex(“# A8F”)
rgbaHex(“# AA88FF”)
rgbaHex('#AA88FF', 0.5)
rgbaHex(“# a8f”、“0.85”)
/ /等。
rgbaHex('rgba(170,136,255,0.8);')
rgbaHex('rgba(170,136,255,0.8)')
rgbaHex('rgb(170,136,255)')
rgbaHex('rg170,136,255')
rgbaHex(' 170,136,255 ')
rgbaHex 170,136,255,0.8 ([])
rgbaHex ([170136255])
/ /等。
当你在3D环境中工作时(webGL, ThreeJS),你有时需要为网格的不同面创建3个值,基本的一个(主色),一个浅一点的和一个深一点的:
material.color.set( 0x660000, 0xff0000, 0xff6666 ); // red cube
我们可以从主RBG颜色创建这3个值:255,0,0
function rgbToHex(rgb) {
var hex = Number(rgb).toString(16);
if (hex.length < 2) {
hex = "0" + hex;
}
return hex;
};
function convertToHex(r,g,b) {
var fact = 100; // contrast
var code = '0x';
// main color
var r_hexa = rgbToHex(r);
var g_hexa = rgbToHex(g);
var b_hexa = rgbToHex(b);
// lighter
var r_light = rgbToHex(Math.floor(r+((1-(r/255))*fact)));
var g_light = rgbToHex(Math.floor(g+((1-(g/255))*fact)));
var b_light = rgbToHex(Math.floor(b+((1-(b/255))*fact)));
// darker
var r_dark = rgbToHex(Math.floor(r-((r/255)*(fact*1.5)))); // increase contrast
var g_dark = rgbToHex(Math.floor(g-((g/255)*(fact*1.5))));
var b_dark = rgbToHex(Math.floor(b-((b/255)*(fact*1.5))));
var hexa = code+r_hexa+g_hexa+b_hexa;
var light = code+r_light+g_light+b_light;
var dark = code+r_dark+g_dark+b_dark;
console.log('HEXs -> '+dark+" + "+hexa+" + "+light)
var colors = [dark, hexa, light];
return colors;
}
在你的ThreeJS代码中简单地写:
var material = new THREE.MeshLambertMaterial();
var c = convertToHex(255,0,0); // red cube needed
material.color.set( Number(c[0]), Number(c[1]), Number(c[2]) );
结果:
// dark normal light
convertToHex(255,255,255) HEXs -> 0x696969 + 0xffffff + 0xffffff
convertToHex(255,0,0) HEXs -> 0x690000 + 0xff0000 + 0xff6464
convertToHex(255,127,0) HEXs -> 0x690000 + 0xff0000 + 0xff6464
convertToHex(100,100,100) HEXs -> 0x292929 + 0x646464 + 0xa0a0a0
convertToHex(10,10,10) HEXs -> 0x040404 + 0x0a0a0a + 0x6a6a6a
建立了我自己的十六进制RGB转换器。我希望这能帮助到一些人。
我用react来做沙盒。
用法:
根据官方文档安装React,或者如果你全局安装了npx,运行npx create-react-app hexto -rgb
import React, { Component, Fragment } from 'react';
const styles = {
display: 'block',
margin: '20px auto',
input: {
width: 170,
},
button: {
margin: '0 auto'
}
}
// test case 1
// #f0f
// test case 2
// #ff00ff
class HexToRGBColorConverter extends Component {
state = {
result: false,
color: "#ff00ff",
}
hexToRgb = color => {
let container = [[], [], []];
// check for shorthand hax string
if (color.length >= 3) {
// remove hash from string
// convert string to array
color = color.substring(1).split("");
for (let key = 0; key < color.length; key++) {
let value = color[key];
container[2].push(value);
// if the length is 3 we
// we need to add the value
// to the index we just updated
if (color.length === 3) container[2][key] += value;
}
for (let index = 0; index < color.length; index++) {
let isEven = index % 2 === 0;
// If index is odd an number
// push the value into the first
// index in our container
if (isEven) container[0].push(color[index]);
// If index is even an number
if (!isEven) {
// again, push the value into the
// first index in the container
container[0] += color[index];
// Push the containers first index
// into the second index of the container
container[1].push(container[0]);
// Flush the first index of
// of the container
// before starting a new set
container[0] = [];
}
}
// Check container length
if (container.length === 3) {
// Remove only one element of the array
// Starting at the array's first index
container.splice(0, 1);
let values = container[color.length % 2];
return {
r: parseInt(values[0], 16),
g: parseInt(values[1], 16),
b: parseInt(values[2], 16)
}
}
}
return false;
}
handleOnClick = event => {
event.preventDefault();
const { color } = this.state;
const state = Object.assign({}, this.state);
state.result = this.hexToRgb(color);
this.setState(state);
}
handleOnChange = event => {
event.preventDefault();
const { value } = event.currentTarget;
const pattern = /^([a-zA-Z0-9])/;
const boundaries = [3, 6];
if (
pattern.test(value) &&
boundaries.includes(value.length)
) {
const state = Object.assign({}, this.state);
state.color = `#${value}`;
this.setState(state);
}
}
render() {
const { color, result } = this.state;
console.log('this.state ', color, result);
return (
<Fragment>
<input
type="text"
onChange={this.handleOnChange}
style={{ ...styles, ...styles.input }} />
<button
onClick={this.handleOnClick}
style={{ ...styles, ...styles.button }}>
Convert hex to rgba
</button>
{
!!result &&
<div style={{ textAlign: 'center' }}>
Converted { color } to { JSON.stringify(result) }
</div>
}
</Fragment>
)
}
}
export default App;
快乐编码=)