Applies a true Gaussian blur to the image (warning: this is VERY slow)
Usage
- @param {number} r the pixel radius of the blur
 - @param {function(Error, Jimp)} cb (optional) a callback for when complete
 
import jimp from 'jimp';
async function main() {
  const image = await jimp.read('test/image.png');
  image.resize(150, jimp.AUTO);
}
main();
