Can an image be transformed with a gradient map using HTML5 or CSS3?

Can an image be recolored using a gradient map in HTML5 or CSS3? I am also open to utilizing javascript libraries for this task.

I came across a similar question where the solution only greyscales and adjusts RGB values: How can I use a gradient map to tone a HTML5 canvas with an image in the canvas.

Unfortunately, it seems that assigning a true gradient to recolor an image with this method is not possible. If anyone has any suggestions or recommendations, please share them with me!

To help illustrate the effect to those who may be unfamiliar, here is a link to an image showing the effect created with an image editor:

Thank you!

Answer №1

One way to enhance your images is by utilizing CSS image filter properties. Check out this helpful link:

Answer №2

Unfortunately, there isn't a built-in solution for this task.

However, you can achieve the desired result by applying some JavaScript post-processing on the image.

Check out this helpful resource that goes into detail on how to manipulate images using canvas elements:

Image Editing Techniques with Canvas

In essence, you'll need to utilize getImageData() to access pixels and putImageData() to make changes. The provided link offers a similar example for reference.

Answer №3

Check out the amazing library known as gradientmaps.js* that handles this task flawlessly.

<img id="myimage" src="photo.jpg">

<script src="gradientmaps.min.js"></script>
<script>
  var target = document.getElementById('myimage');
  var gradientMap = "blue, green, yellow";

  GradientMaps.applyGradientMap(target, gradientMap);
</script>

This code snippet translates your color list into SVG filter code, creates an <svg> element, gives a unique id to the <filter> element, and then applies the filter to your HTML element.

After running the example above, the structure of the DOM will transform to appear like this....

<svg version="1.1" width="0" height="0">
  <filter id="filter-1489690359932">
    <feColorMatrix type="matrix" values="0.2126 0.7152 0.0722 0 0 0.2126 0.7152 0.0722 0 0 0.2126 0.7152 0.0722 0 0 0 0 0 1 0" result="gray"></feColorMatrix>
    <feComponentTransfer color-interpolation-filters="sRGB">
      <feFuncR type="table" tableValues="0 0 1"></feFuncR>
      <feFuncG type="table" tableValues="0 0.5019607843137255 1"></feFuncG>
      <feFuncB type="table" tableValues="1 0 0"></feFuncB>
      <feFuncA type="table" tableValues="1 1 1"></feFuncA>
    </feComponentTransfer>
  </filter>
</svg>
<img id="myimage" src="photo.jpg" 
     data-gradientmap-filter="filter-1489690359932" 
     style="filter: url(&quot;#filter-1489690359932&quot;);">

* The link provided is for my enhanced version of the project which includes compatibility with IE / Edge browsers.

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