gistfile1.txt

var ndarray = require('ndarray')

//Context is a canvas 2d context
var imageData = context.createImageData(WIDTH, HEIGHT)

//Wrap pixels in an ndarray with shape [width x height x 4 (rgba)]
var ndpixels = ndarray(imageData.data, [WIDTH, HEIGHT, 4], [4, 4 * WIDTH, 1], 0)

//Now you can edit pixels as an ndarray!
// ...

//When done, you blit back using the original image
context.putImageData(imageData)