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exif.js获取照片扩展信息

博客分类：

js插件

以下为引用代码： <!doctype html>
	<html>
	<head>
	<script type="text/javascript" src="../exif.js"></script>

	</head>
	<body>
	Upload a local file to read Exif data.
	<br/>
	<input id="file-input" type="file" />
	<br/><br/>

	Click the images to read Exif data. The first image tests reading single tags, while the other two simply show all available data.
	<br/><br/>
	Note: these examples will not work if running from a local file:// URL.
	<br/><br/>
	<img src="DSCN0614_small.jpg" id="img1" />
	<br/>
	<img src="Bush-dog.jpg" id="img2" />
	<br/>
	<img src="dsc_09827.jpg" id="img3" /><br/>
	<br/>
	<button id="objecturltest">Object URL Test</button><br/>
	<br/>
	<button id="blobtest">Blob Test</button><br/>
	<br/>
	<button id="base64test">Base64 Test</button><br/>


	<script>
	document.getElementById("img1").onclick = function() {
	EXIF.getData(this, function() {
	var make = EXIF.getTag(this, "Make"),
	model = EXIF.getTag(this, "Model");
	alert("I was taken by a " + make + " " + model);
	});
	}

	document.getElementById("img2").onclick = function() {
	EXIF.getData(this, function() {
	alert(EXIF.pretty(this));
	});
	}

	document.getElementById("img3").onclick = function() {
	EXIF.getData(this, function() {
	alert(EXIF.pretty(this));
	});
	}

	document.getElementById("file-input").onchange = function(e) {
	EXIF.getData(e.target.files[0], function() {
	alert(EXIF.pretty(this));
	});
	}

	document.getElementById("base64test").onclick = function() {
	var image = new Image();
	image.onload = function() {
	EXIF.getData(image, function() {
	alert(EXIF.pretty(this));
	});
	};
	image.src = 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	}


	document.getElementById("objecturltest").onclick = function() {
	var http = new XMLHttpRequest();
	http.open("GET", "DSCN0614_small.jpg", true);
	http.responseType = "blob";
	http.onload = function(e) {
	if (this.status === 200) {
	var image = new Image();
	image.onload = function() {
	EXIF.getData(image, function() {
	alert(EXIF.pretty(this));
	});
	};
	image.src = URL.createObjectURL(http.response);

	}
	};
	http.send();
	}


	document.getElementById("blobtest").onclick = function() {
	var http = new XMLHttpRequest();
	http.open("GET", "DSCN0614_small.jpg", true);
	http.responseType = "blob";
	http.onload = function(e) {
	if (this.status === 200) {
	EXIF.getData(http.response, function() {
	alert(EXIF.pretty(this));
	});
	}
	};
	http.send();
	}
	</script>



	</body>
	</html>

首先自己input file选择的图片readAsDataURL获取到base64的字符串, 再用 binaryajax获取图片的二进制数据(data-url to a binary string). 然后根据二进制数据利用exif.js获取exif信息(主要是exif.Orientation), 再用去重新画图, 再读取新的base64图片

1 是iOS6的bug, 较大的图片可能会发生(大概>2M), 已经有人提交bug给 Apple了(iOS7未测试). 2 是因为相机拍摄的图片本身可能就是反转的, 拍摄的图片里EXIF信息的 orientation记录了图片的转向(取值范围是1/3/6/8, 一般是:1/3/6/8). 默认竖拍的时候其实就是翻转的, 这时的orientation=6(相当于向左转90度, -90deg) .....

http://blog.csdn.net/yaoyuan_difang/article/details/38656461

exif-js-master.zip (793.2 KB)
下载次数: 1

分享到：

test | 在webapp上使用input:file, 指定capture属 ...

2015-06-19 09:58
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exif.js获取照片扩展信息

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