apply gaussian filter on image in javascript

One way to apply Gaussian filter on an image in javascript is by using the library called @mohayonao/img-filter. Here's how you can use it:

// import the library
const imgFilter = require('@mohayonao/img-filter');

// load image using an appropriate method
// e.g. using canvas element
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
const image = new Image();
image.onload = () => {
  canvas.width = image.width;
  canvas.height = image.height;
  context.drawImage(image, 0, 0);
  // apply Gaussian filter
  const filteredImageData = imgFilter.gaussianBlur(context.getImageData(0, 0, canvas.width, canvas.height), 5);
  // display filtered image
  context.putImageData(filteredImageData, 0, 0);
};
image.src = 'path/to/image';

631 chars
20 lines

In the example above, imgFilter.gaussianBlur() method is used to apply the Gaussian filter on the image. The first argument to this method is the ImageData object representing the image, and the second argument is the size of the filter kernel (odd integer values only). The filtered image data is returned, which can be displayed using context.putImageData() method.

Alternatively, you can implement custom code to create and apply Gaussian filter kernel and convolve it with the image data. This can be achieved using a combination of TypedArrays and nested loops.