SodhanaLibrary

Many websites are using blurred images in background. If you want to highlight part of the image, what will you do ? Maybe drawing some shape on the image with red marker. We can do this with SVG filter and mask components. UnBlurring the part of completely blurred image will give better and clean attention.

Click here to see DEMO

Please have look at below code.

<svg class="blur" xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink" width="750" height="498">
      <!-- Image that was blurred and half brightend -->      
      <image filter="url(#filter2)" xlink:href="https://lh3.googleusercontent.com/-zJ3ijSNpElc/VyGE80Uo5PI/AAAAAAAADk4/w2cGycz0gIoGz5HDci02WU70uXqJnhYAgCCo/s912/inNature.JPG" width="100%" height="100%"></image>
      <!-- filter to control blur and brightness -->      
      <filter id="filter2">        
        <!-- standard deviation to control blur -->
        <feGaussianBlur stdDeviation="7"></feGaussianBlur>
        <!-- standard deviation to control brightness -->         
        <feComponentTransfer>          
          <feFuncR  type="linear" slope="0.5"></feFuncR>
          <feFuncG type="linear" slope="0.5"></feFuncG>          
          <feFuncB type="linear" slope="0.5"></feFuncB>          
        </feComponentTransfer>      
      </filter>      
      <!-- mask to unblur the part of the image -->
      <mask id="mask1">       
        <circle cx="177" cy="166" r="150" fill="white" style="opacity: 1;"></circle>
      </mask>       
      <!-- image to show unblurred image part -->
      <image xlink:href="https://lh3.googleusercontent.com/-zJ3ijSNpElc/VyGE80Uo5PI/AAAAAAAADk4/w2cGycz0gIoGz5HDci02WU70uXqJnhYAgCCo/s912/inNature.JPG"
        width="100%" height="100%" mask="url(#mask1)"></image>    
</svg>