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HTML

              
                <div class="container">
  <h1>JPG+PNG to SVG Mask</h1>
  
  <h3><a href="https://codepen.io/shshaw/full/LVKEdv" target="_blank" class="jpng">For an easier process, give <u>JPNG.svg</u> a try.</a></h3>
  
  <p><strong>Combine the transparency of a PNG with the compression of a JPEG.</strong> Based on the idea from <a href="http://peterhrynkow.com/how-to-compress-a-png-like-a-jpeg/">Using SVG to Shrink Your PNGs</a>, but adapted to use data URIs instead of external images. Include on your page as inline SVG, using an <code>&lt;img src="image.svg"/&gt;</code> tag, or as a <code>background-image</code>.</p>
  
  <p><small><em>Tested in the latest versions of Chrome, Firefox and Safari. This SVG technique's compatibility via an <code>&lt;img /&gt;</code> tag or as a <code>background-image</code> may not be perfect. See <a href="https://codepen.io/shshaw/pen/IDbqC" target="_blank">this pen</a> to test on your browser. Inline seems to be the best option for compatibility, in which case you should use external assets so that they can be cached. Please fork or comment to improve.</em></small></p>
  
  <p>To get started, upload two images:</p>

  <ul>
    <li>One as your primary image, named whatever <small>(Try <a href="http://brokensquare.com/Code/assets/face.jpg" target="_blank" download="face.jpg">this one</a>)</small></li>
    <li>One as a mask <small><em>(Black and white. PNG is usually best, like <a href="http://brokensquare.com/Code/assets/face-mask.png" target="_blank" download="face-mask.png">this one</a>)</em></small> with <code>-mask</code> or <code>-alpha</code> in the filename .</li>
  </ul>

  <h2>Upload:</h2>
  <label for="files" id="upload">Images: <input type="file" id="files" name="files" multiple> <br />
    <small><em>Make sure the mask has '-mask' or '-alpha' in the filename.</em></small>
  </label>

  <div id="output" style="display: none;">
    <p>Copy and paste code to use inline:</p>
    <textarea id="code"></textarea>

    <p>Or click the preview below to download the SVG:</p>
    <div id="preview"></div>
  </div>

<h2>Example:</h2>
<div class="examples">
  <a href="http://brokensquare.com/Code/assets/face.jpg" target="_blank" download="face.jpg" class="example"><strong>Image:</strong> <img src="http://brokensquare.com/Code/assets/face.jpg" /></a>
  <a href="http://brokensquare.com/Code/assets/face-mask.png" target="_blank" download="face-mask.png" class="example"><strong>Mask:</strong> <img src="http://brokensquare.com/Code/assets/face-mask.png" /></a>
  
  <a href="https://cl.ly/1L433346393M/download/face.svg" target="_blank" download="face-mask.png" class="example output">
  <strong>Output</strong>
    <img src="http://brokensquare.com/Code/assets/face.svg" />
  </a>
</div>

</div>

              
            
!

CSS

              
                @import "lesshat";

html, body { margin: 0; padding: 0; min-height: 100%; }
.container { padding: 20px; margin: 0 auto; }
h1 { margin: 0; }

.jpng { display: block; color: #4E1E1E; text-decoration: none; background: #FBE6A2; padding: 0.75em 1em; text-align: center; }
.jpng:hover,
.jpng:focus { outline: solid 3px; }

#upload { 
  background: #EEE;
  text-align: center;
  padding: 20px;
  display: block;
  cursor: pointer;
}
#upload input { cursor: pointer; margin-bottom: 10px; }

#output { display: none; }

#code {
  font-family: monospace;
  font-size: 12px;
  display: block;
  width: 100%;
  height: 150px;
  overflow: auto;
  background: #DDD;
  border: none;
  word-break: keep-all;
}

.examples { text-align: center; }
.example { display: inline-block; width: 30%; text-decoration: none; }
.example img { max-width: 100%; height: auto;}
              
            
!

JS

              
                console.clear();

// SVG alpha mask idea from https://gist.github.com/peterhry/afac4906f2b330509fc7
var template = '<svg preserveAspectRatio="xMinYMin" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 {{image.width}} {{image.height}}">\n	<defs>\n		<mask id="mask">\n		<image width="{{mask.width}}" height="{{mask.height}}" xlink:href="{{mask.src}}"></image>\n 		</mask>\n	</defs>\n	<image mask="url(#mask)" id="image" width="{{image.width}}" height="{{image.height}}" xlink:href="{{image.src}}"></image>\n</svg>',
    images = {
      "mask": { "loaded": false },
      "image": { "loaded": false }
    };


function svgOutput() {
  // Wait until mask and image are loaded
  if ( images.mask.loaded === true && images.image.loaded === true ) {
    console.table(images);
  
    var output = document.getElementById("output"),
        code = document.getElementById("code"),
        preview = document.getElementById("preview"),
        formatted = template;

    formatted = formatted.replace(/{{image.height}}/g,images.image.data.height);
    formatted = formatted.replace(/{{image.width}}/g,images.image.data.width);
    formatted = formatted.replace(/{{image.src}}/g,images.image.data.src);
    formatted = formatted.replace(/{{mask.width}}/g,images.mask.data.width);
    formatted = formatted.replace(/{{mask.height}}/g,images.mask.data.height);
    formatted = formatted.replace(/{{mask.src}}/g,images.mask.data.src);

    // Give a preview the user can click to download
    preview.innerHTML = "<a href='data:Application/octet-stream,"+ encodeURIComponent(formatted) +"' download='" + images.image.name.replace(/\.[^/.]+$/, "") + ".svg'>" +formatted + "</a>";

    code.innerHTML = formatted.replace(/</g,"&lt;").replace(/>/g,"&gt;");

    output.style.display = "block";
  
    // Reset images
    images = {
      "mask": { "loaded": false },
      "image": { "loaded": false }
    };
  
    return formatted;
  }
}


function imageToObject(image) {
  
  var src = image.result;
  var type = image.type;
  
  image.data = {};
  image.data.src = src.replace("data:;","data:" + type + ";");

  var img = document.createElement('img');
  
  img.src = src;
  img.style.display = "none";
  document.body.appendChild(img);
  
  // Wait for img to load to get accurate width & height
  img.onload = function () {
    image.data.height = this.height;
    image.data.width = this.width;
    image.loaded = true;
    document.body.removeChild(this);
    svgOutput();
  };
  
  return image;
}


// Image to Data URI conversion adapted from http://www.techmcq.com/article/Converting-an-image-into-data-URI-using-JavaScript-FileReader/61
function fileSelected(evt) {
  var files = evt.target.files;

  for (var i = 0; i < files.length; i++) {

    var f = files[i],
        role = "image";
    
    if ( f.type.indexOf("image") == 0 ) {
      console.log("image!");

      if ( f.name.indexOf("-mask") > 0 || f.name.indexOf("-alpha") > 0 ) {
        role = "mask";
      }

      if ( images[role].loaded === false ) {

        images[role] = new FileReader();
        images[role].loaded = "pending";
        images[role].type = f.type;
        images[role].name = f.name;
        
        images[role].onload = function(){
          imageToObject(this);
          svgOutput();
        }
        
        images[role].readAsDataURL(f); //on successful read, fr.onload function will be called and that will populate the result in fileContent container
       
      }
    }
  }
}
   
  //attach change event of file control
document.getElementById('files').addEventListener('change', fileSelected, false);
              
            
!
999px

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