`

exif.js获取照片扩展信息

 
阅读更多

 

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>

用到的js: 1. megapix-image.js, https://github.com/stomita/ios-imagefile-megapixel 2. exif.js, https://github.com/jseidelin/exif-js 3. binaryajax.js, https://github.com/jseidelin/binaryajax/ 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

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