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HTML

              
                <div class="browserNotification">For the best possible experience, please use Chrome or Firefox to view this page</div>

<div class="screen">
  <div>
    <div class="screen1">
      <h1>Welcome to <a href="https://www.aweber.com" target="_blank">AWeber’s</a> Duo-Tone Filter for&nbsp;Email&nbsp;Images!</h1>
      <p>
        <a href="https://designmodo.com/duotone-website-design/" target="_blank">Duo-tone</a> images are a great way to add a playful, yet sophisticated look and feel to your emails. Choose the color you’d like to apply to an image then drag the image into the box below (or upload an image).
      </p>
    </div>

    <div class="screen2">
      <h2>All done duo-toning!</h2>
      <p>
        Download the image and add it to your email (We recommend using AWeber's "West" template)! Enjoy!
      </p>
      <div class="element">
        <a onclick="startOver()" class="btn btn--secondary">Start Over</a>
        <a onclick="downloadIt()" class="btn">Download</a>
      </div>
    </div>
  </div>
  
  <div>
    <div class="screen__elements">
      <div class="element">
        <label for="custom"><strong>Pick a color:</strong> </label><input type='text' name="color" id="color" /><br>
      </div>

      <div class="element advanced">
        <a onClick="advancedTray(this)">advanced options</a>
        <div id="advancedOptions" class="advanced__options">
          <label for="contrast"><strong>Contrast:</strong> </label><input id="contrast" type="range" min="0.5" max="2" step="0.1" /><input type="number" id="contrastNum" min="0.5" max="2" step="0.1" /><br>
          <label for="blendMode"><strong>Blend Mode:</strong> </label>
          <select id="blendMode">
            <option value="multiply">Multiply</option>
            <option value="overlay">Overlay</option>
            <option value="screen">Screen</option>
            <option value="luminosity">Luminosity</option>
            <option value="color-dodge">Color Dodge</option>
            <option value="color-burn">Color Burn</option>
          </select>
        </div>
      </div>

      <div class="screen1">
        <div id="dropZone">Drop your image here</div>

        <div class="element">
          <label for="file" class="file">Or choose a file</label>
          <input type="file" name="file" id="file" accept="image/*" capture>
        </div>
      </div>

      <div class="screen2">
        <div class="screen__elements">
          <canvas id="image" class="finalImage"></canvas>
        </div>
      </div>

    </div>
  </div>
</div>

<div class="builtBy">
  <img src="https://preview.ibb.co/m3m6Hk/Pixel_Team.gif" alt="Pixel Team" border="0" width="54" /><br>
  Made by Kim and Chris from&nbsp;<a href="https://www.aweber.com" target="_blank">AWeber</a>,<br/>
  an absolutely AWesome email company.<br>
</div>
              
            
!

CSS

              
                $borderRad: 12px;
$bgColor: #EEEEEE;
$fontColor: #4a4a4a;
$primary: #08AAC7;
$secondary: #CCCCCC;
$canvasWidth: 600px;
$boxShadow: rgba(0, 0, 0, 0.2) 0px 6px 8px -4px;

body {
  background-color: $bgColor;
  color: $fontColor;
  font-family: helvetica, arial, sans-serif;
  font-size: 16px;
  line-height: 1.3;
  text-align: center;
}

a {
  color: $primary;
  font-weight: 700;
  text-decoration: none;
  transition-duration: 0.3s;
  
  &:hover {
    color: darken($primary, 5%);
  }
}

h1,
h2 {
  font-size: 1.5em;
  text-align: left;
  
  a {
    color: $fontColor;
    text-decoration: underline;
  }
}

p {  
  margin-bottom: 36px;
  text-align: left;
  
  a {
    color: $fontColor;
    text-decoration: underline;
  }
}

// @TODO fix browser issues so you can remove this!
.browserNotification {
  background-color: darken($bgColor, 5%);
  font-size: 14px;
  padding: 8px;
  position: fixed;
  text-align: center;  
  top: 0;
  width: 100%;
  z-index: 200;
}

.screen {
  display: flex;
  flex-wrap: wrap;
  max-width: 960px;
  margin: 50px auto 0;
  width: 100%;
  
  > div {
    &:first-child {
      width: 33%;
    }
    
    &:last-child {
      width: 66%;
    }
    
    @media screen and (max-width: 960px) {
      flex-basis: 100%;
    }
  }
  
  .screen2 {
    display: none;
  }
  
  &__elements {
    margin: 10px auto 40px;
    max-width: $canvasWidth;
    width: 100%;
  }
}

.builtBy {
  background-color: $bgColor;
  box-sizing: border-box;
  color: lighten($fontColor, 15%);
  font-size: 0.8em;
  line-height: 1.3;
  padding: 5px 20px 20px;
}

.element {
  display: block;
}

// Advanced Options
.advanced {
  margin-top: 0.5rem;
  
  a {
    font-size: 0.8rem;
    font-weight: 400;
  }
  
  &__options {
    background: lighten($secondary, 10%);
    border: 1px solid $secondary;
    border-radius: $borderRad;
    display: none;
    padding: 0.5rem;
  }
}

.btn,
label.file,
.sp-button-container .sp-choose {
  background: $primary;
  border: none;
  border-radius: $borderRad * 2;
  color: #FFFFFF;
  cursor: pointer;
  display: inline-block;
  font-weight: 500;
  margin-bottom: 1rem;
  padding: 10px 15px;
  transition-duration: 0.3s;
  
  &:hover {
    color: #FFFFFF;
    background: darken($primary, 5%);
    border: none;
  }
  
  &--secondary {
    background: $secondary;
    color: $fontColor;
    
    &:hover {
      background: darken($secondary, 5%);
      color: $fontColor;
    }
  }
}

label.file {
  border-radius: 0 0 $borderRad $borderRad;
  box-shadow: $boxShadow;
  display: block;
  padding: 15px;
}

.sp-button-container .sp-choose {
  margin: 0;
  padding: 10px;
}

input[type="file"] {
  display: none;
}

#dropZone {
  background-color: #ffffff;
  border: 2px dashed $secondary;
  border-bottom: none;
  border-radius: $borderRad $borderRad 0 0;
  box-sizing: border-box;
  clear: both;
  cursor: pointer;
  margin: 20px auto 0;
  padding: 80px;
  transition: opacity 0.3s ease-in-out;
}

.finalImage {
  box-shadow: $boxShadow;
  height: auto;
  left: 0;
  margin-bottom: 10px;
  max-width: $canvasWidth;
  opacity: 0;
  
  &#snapshot {
    opacity: 1;
  }
}


// Color Picker
.sp-replacer {
  background: white;
  border-color: $secondary;
  border-radius: $borderRad / 2;
  padding: 3px;
  
  &.sp-active {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    border-bottom-width: 0;
    border-color: $primary;
  }
  
  .sp-preview {
    border-width: 0;
    border-radius: $borderRad / 4;
    margin-right: 3px;
    overflow: hidden;
  }
  
  .sp-dd {
    padding-right: 3px;
  }
}

.sp-container {
  background: #FFFFFF;
  border-radius: 0 $borderRad/2 $borderRad/2;
  border-color: $primary;
  margin-top: -1px;
}
              
            
!

JS

              
                console.clear();

// TODO: Add message for unsupported browsers.
var canvas = document.getElementById('image'),
    input = document.getElementById('file'),
    theImg,
    blendColor = "#80c4c2",
    contrast = 1.2,
    ctx = canvas.getContext('2d'),
    fadeTime = 120,
    currentFilter = 'grayscale(100%)',
    currentBlend = 'multiply';

// Pass image to render function
function loadImage(src){
  var reader = new FileReader();
  reader.onload = function(e){
    render(e.target.result);
  };
  reader.readAsDataURL(src);
}


// Draw image to canvas and apply filters
function render(src){
  var image = new Image();
  
  image.onload = function(){
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    canvas.width = image.width;
    canvas.height = image.height;
    ctx.fillStyle = blendColor;
    ctx.fillRect(0,0,canvas.width,canvas.height);
    // @TODO find solution for no .filter support in IE or Safari. Consider this approach: https://www.html5rocks.com/en/tutorials/canvas/imagefilters/
    ctx.filter = currentFilter + ' contrast(' + contrast + ')';
    ctx.globalCompositeOperation = currentBlend;
    ctx.drawImage(image, 0, 0, image.width, image.height);
  };
  
  image.src = src;
}


// Download contents on canvas using filesaver.js
// @Todo investigate bug downloading in Safari
function downloadIt(){
  canvas.toBlob(function(blob) {
    saveAs(blob, "duotone.png");
  }, "image/png");
}


// Go back to first step and reset canvas
function startOver(){
  screenFade();
}


// Fade between stages of the screen
function screenFade(){
  // Go from step 1 to step 2
  if($('.screen1').is(':visible')){
    $('.screen1').fadeOut(fadeTime, function(){
      $('.screen2').fadeIn(fadeTime, function(){
        $('#image').animate({
          marginTop: '0',
          opacity: '1'
        }, 300);
      });
    });
  }
  // Go from step 2 to step 1 and clear the canvas
  else {
    $('.screen2').fadeOut(fadeTime, function(){
      $('.screen1').fadeIn();
      $('#image').css({
        marginTop: '10px',
        opacity: '0'
      });
      ctx.clearRect(0, 0, canvas.width, canvas.height);
    });
  }
}


// Set up dropzone
var target = document.getElementById('dropZone');
target.addEventListener("dragover", function(e){e.preventDefault();}, true);
target.addEventListener("drop", function(e){
	e.preventDefault(); 
  theImg = e.dataTransfer.files[0];
	loadImage(theImg);
  screenFade();
}, true);


// Set up filepicker button
input.addEventListener("change", function(e) {
  e.preventDefault();
  theImg = e.srcElement.files[0];
  loadImage(theImg);
  screenFade();
}, true);


// Initialize Spectrum color picker
$("#color").spectrum({
  color: blendColor,
  showInput: true,
  preferredFormat: "hex",
  change: function(color) {
    blendColor = color.toHexString();
    ctx.fillstyle = blendColor;
    ctx.fillRect(0,0,canvas.width,canvas.height);
    if(theImg){
      loadImage(theImg);
    }
  }
});


// Init Contrast Slider
$('#contrast').val(contrast);
$('#contrastNum').val(contrast);
function contrastChange(inpt, inpt2){
  $(inpt).on('input', function(){
    contrast = $(this).val();
    $(inpt2).val(contrast);
    if(theImg){
      loadImage(theImg);
    }
  });
}
contrastChange('#contrast', '#contrastNum');
contrastChange('#contrastNum', '#contrast');


// Init blend mode picker
$('#blendMode').on('input', function(){
  currentBlend = $(this).val();
  if(theImg){
    loadImage(theImg);
  }
});


// Slide open advanced tray
function advancedTray(trig){
  $(trig).fadeOut(200, function(){
    $('#advancedOptions').fadeIn();
  });
}
              
            
!
999px

Console