<template> <div class="container"> <img :src="originalImage" class="original" @load="convertToBlackAndWhite"> <img :src="blackAndWhiteImage" class="black-and-white" v-show="blackAndWhite"> </div> </template> <script> export default { data() { return { originalImage: 'images/pic.jpg', blackAndWhiteImage: '', blackAndWhite: false }; }, methods: { convertToBlackAndWhite() { let canvas = document.createElement('canvas'); let ctx = canvas.getContext('2d'); let img = document.querySelector('.original'); canvas.width = img.width; canvas.height = img.height; ctx.drawImage(img, 0, 0); let imageData = ctx.getImageData(0, 0, canvas.width, canvas.height); let data = imageData.data; for (let i = 0; i < data.length; i += 4) { let brightness = (data[i] + data[i + 1] + data[i + 2]) / 3; if (brightness > 128) { data[i] = 255; data[i + 1] = 255; data[i + 2] = 255; } else { data[i] = 0; data[i + 1] = 0; data[i + 2] = 0; } } ctx.putImageData(imageData, 0, 0); this.blackAndWhiteImage = canvas.toDataURL(); this.blackAndWhite = true; } } }; </script> <style scoped> .container { display: flex; justify-content: center; align-items: center; height: 100vh; } .original, .black-and-white { max-width: 300px; } .black-and-white { display: none; } </style>
标签: Vue图片处理
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