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feat: typed Array的应用图像处理

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= 2024-05-31 15:30:45 +08:00
parent 59de005538
commit 61d989f779
1 changed files with 75 additions and 0 deletions
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html/图像灰度处理.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Image Processing Demo</title>
</head>
<body>
<input type="file" id="fileInput" accept="image/*">
<canvas id="canvas" style="display: none;"></canvas>
<img width="500px" height="500px" id="image" src="" alt="Image" style="max-width: 100%;">
<button id="grayscaleBtn">灰度</button>
<button id="invertBtn">颜色反转</button>
<script>
const fileInput = document.getElementById('fileInput');
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const imageElement = document.getElementById('image');
const grayscaleBtn = document.getElementById('grayscaleBtn');
const invertBtn = document.getElementById('invertBtn');
let imageData;
fileInput.addEventListener('change', function(e) {
const file = e.target.files[0];
const reader = new FileReader();
reader.onload = function(event) {
const img = new Image();
img.onload = function() {
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
imageData = ctx.getImageData(0, 0, img.width, img.height);
imageElement.src = canvas.toDataURL();
};
img.src = event.target.result;
};
reader.readAsDataURL(file);
});
grayscaleBtn.addEventListener('click', function() {
if (imageData) {
grayscale(imageData.data);
ctx.putImageData(imageData, 0, 0);
imageElement.src = canvas.toDataURL();
}
});
invertBtn.addEventListener('click', function() {
if (imageData) {
invertColors(imageData.data);
ctx.putImageData(imageData, 0, 0);
imageElement.src = canvas.toDataURL();
}
});
function grayscale(data) {
for (let i = 0; i < data.length; i += 4) {
const brightness = (data[i] + data[i + 1] + data[i + 2]) / 3;
data[i] = brightness;
data[i + 1] = brightness;
data[i + 2] = brightness;
}
}
function invertColors(data) {
for (let i = 0; i < data.length; i += 4) {
data[i] = 255 - data[i]; // 反转红色通道
data[i + 1] = 255 - data[i + 1]; // 反转绿色通道
data[i + 2] = 255 - data[i + 2]; // 反转蓝色通道
}
}
</script>
</body>
</html>