Create layers for each pixel with opacities

createLayers.js

let sketch = require('sketch')
let Rectangle = sketch.Rectangle
let ShapePath = sketch.ShapePath
let Style = sketch.Style
let Group = sketch.Group

let document = sketch.getSelectedDocument()
let selection = document.selectedLayers.layers[0]

let nativeSelection = selection.sketchObject
let data = nativeSelection.image().data()
let imageRep = NSBitmapImageRep.imageRepWithData(data)
let pixelsHigh = imageRep.pixelsHigh()
let pixelsWide = imageRep.pixelsWide()

let pixelLayers = new Group({
  name: 'pixel layers',
  parent: selection.parent,
  frame: selection.frame
})

for (let i=0; i < pixelsWide; i++) {
  for (let j=0; j < pixelsHigh; j++) {
    let color = imageRep.colorAtX_y(i,j)
    let mscolor = MSColor.colorWithNSColor(color)

    let rectangle = new ShapePath({
      frame: { x: i, y: j, width: 1, height: 1 },
      style: { fills: [{color: mscolor, fillType: Style.FillType.Color}] },
      parent: pixelLayers,
    })
  }
}