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Get the structural similarity between two images.

☁️ Installation

# Using npm 
npm install --save img-ssim
# Using yarn 
yarn add img-ssim

📋 Example

const imgSSIM = require("img-ssim");
  , ""
  , (err, similarity) => {
    console.log(err || similarity);
    // => 0.7683075604309328
  , ""
  , { enforceSameSize: false, resize: true }
  , (err, similarity) => {
    console.log(err || similarity);
    // => 0.2631629323319616

❓ Get Help

There are few ways to get help:

  1. Please post questions on Stack Overflow. You can open issues with questions, as long you add a link to your Stack Overflow question.

  2. For bug reports and feature requests, open issues. 🐛

  3. For direct and quick help, you can use Codementor. 🚀

📝 Documentation

imgSsim(source, target, options, cb)

Get the structural similarity between two images.

The ssim result will be a value between 0 and 1. The more similar the images are, the higher the value will be.


  • String source: The first image path (local path or url).
  • String target: The second image path (local path or url).
  • Object options: An object containing the following fields:
  • windowSize (Number): The number of pixels of the image splits (default: 8).
  • enforceSameSize (Boolean): By default, the images should have the same size. If this option is false, this will force the images to be compared, even if they have different sizes.
  • resize (Boolean): If the images have different sizes, they will be resized if this option is true. Default is false.
  • Function cb: The callback function.

😋 How to contribute

Have an idea? Found a bug? See how to contribute.

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📜 License

MIT © Ionică Bizău