canvas实现对图片进行素描颜色替换效果代码-html代码-BFW代码库

代码语言：html

所属分类：其他

代码描述：canvas实现对图片进行素描颜色替换效果代码，可上传图文对图片进行黑白素描，颜色替换等效果。

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">

<style>
*{
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	font-size: calc(16px + (24 - 16) * (100vw - 320px) / (2560 - 320));
	--bg: #737a8c;
	--buttonBg: #2762f3;
	--buttonHoverBg: #0c48db;
	--formBg: #fff;
	--inputBorder: #abafba;
	--inputBg: #fff;
	--inputDisableBg: #e3e4e8;
	--pColor: #17181c;
}
body, button, input {
	color: var(--pColor);
	font: 1em/1.5 "Hind", system-ui, -apple-system, sans-serif;
}
body, .upload-btn {
	overflow: hidden;
}
body {
	background: var(--bg);
	display: flex;
	flex-direction: column-reverse;
	height: 100vh;
}
aside, button, canvas, input, main, .upload-btn input[type=file] {
	width: 100%;
}
aside {
	background: var(--formBg);
	box-shadow: 0 0 0.25em hsla(223,10%,10%,0.5);
	overflow: auto;
}
button, input {
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}
button, input[type=color], input[type=file] {
	cursor: pointer;
}
button:hover, button:focus, .btn-link:hover, .btn-link:focus, input[type=file]:hover + button, input[type=file]:focus + button {
	background: var(--buttonHoverBg);
}
button, .btn-link, canvas, input, label {
	display: block;
}
button, .btn-link {
	background: var(--buttonBg);
	border-radius: 0.375em;
	color: #fff;
	margin-bottom: 1.5em;
	padding: 0.75em 1em;
	transition: background 0.1s linear;
}
button:focus, .btn-link:focus {
	outline: 0;
}
canvas {
	image-rendering: pixelated; /* as of Feb 2021, not supported in Firefox */
	object-fit: contain;
	max-height: calc(100vh - 20.375em);
}
form {
	padding: 1.5em 1.5em 0 1.5em;
}
input[type=text], input[type=file] + button, .upload-btn {
	margin-bottom: 0.75em;
}
input {
	background: var(--inputBg);
	border-radius: 0.25em;
	box-shadow: 0 0 0 1px var(--inputBorder) inset;
	padding: 0.75em;
}
input:disabled {
	background: var(--inputDisableBg);
	cursor: not-allowed;
	text-overflow: ellipsis;
}
input[type=color] {
	height: 3em;
	padding: 0.375em;
}
label {
	font-weight: bold;
}
main {
	margin: auto;
}
.btn-link {
	text-align: center;
	text-decoration: none;
}
.btn-group, .colors, .color {
	display: flex;
	justify-content: space-between;
}
.btn-half, .color {
	width: calc(50% - 0.375em);
}
.colors {
	margin-bottom: 1.5em;
}
.color {
	align-items: center;
}
.color label {
	width: 4em;
}
.color input {
	width: calc(100% - 4em);
}
.dl-btn {
	background: #067a1f;
}
.dl-btn:hover, .dl-btn:focus {
	background: #044913;
}
.upload-btn {
	position: relative;
}
.upload-btn input[type=file] {
	position: absolute;
	opacity: 0;
	top: 0;
	left: 0;
	height: 3em;
}
/* Tablet, desktop */
@media screen and (min-width: 768px) {
	body {
		flex-direction: row;
		align-items: center;
	}
	aside {
		width: 20em;
		height: 100%;
	}
	canvas {
		max-height: 100vh;
	}
	main {
		width: calc(100% - 20em);
	}
}
/* Dark theme */
@media (prefers-color-scheme: dark) {
	:root {
		--formBg: #17181c;
		--inputBg: #2e3138;
		--inputDisableBg: #2e3138;
		--inputBorder: #2e3138;
		--pColor: #e3e4e8;
	}
}
</style>

</head>
<body>

<aside>
	<form action="">
		<label for="img_upload">图片</label>
		<div class="upload-btn">
			<input id="img_upload" name="img_upload" type="file" accept="image/*">
			<button type="button" for="img_upload" tabindex="-1">上传</button>
			<input id="img_name" name="img_name" type="text" placeholder="未选择文件" disabled>
		</div>
		<div class="colors">
			<div class="color">
				<label for="color1">颜色 1</label>
				<input id="color1" type="color" name="color1" value="#ffffff">
			</div>
			<div class="color">
				<label for="color2">颜色 2</label>
				<input id="color2" type="color" name="color2" value="#000000">
			</div>
		</div>
		<div class="btn-group">
			<button class="btn-half" id="swap-colors" type="button">填充色对换</button>
			<a href="#" class="btn-link btn-half dl-btn" id="download" download="result.png">下载图片</a>
		</div>
	</form>
</aside>
<main>
	<canvas></canvas>
</main>

<script >
window.addEventListener("DOMContentLoaded",app);
    function app() {
	var form = document.querySelector("form"),
		imgUpload = document.getElementById("img_upload"),
		imgName = document.getElementById("img_name"),
		color1 = document.getElementById("color1"),
		color2 = document.getElementById("color2"),
		swapColorsBtn = document.getElementById("swap-colors"),
		download = document.getElementById("download"),
		canvas = document.querySelector("canvas"),
		c = canvas.getContext("2d"),
		img = null,
		adjustCanvas = () => {
			// restrict image size
			let imgWidth = canvas.width,
				imgHeight = .........完整代码请登录后点击上方下载按钮下载查看