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  • analyze.coffee

  • ¶ 
    class Analyze
  constructor: (@c) ->

  calculateLevels: ->
    levels =
      r: {}
      g: {}
      b: {}
  • ¶

    Initialize all values to 0 first so there are no data gaps

        for i in [0..255]
      levels.r[i] = 0
      levels.g[i] = 0
      levels.b[i] = 0
  • ¶

    Iterate through each pixel block and increment the level counters

        for i in [0...@c.pixelData.length] by 4
      levels.r[@c.pixelData[i]]++
      levels.g[@c.pixelData[i+1]]++
      levels.b[@c.pixelData[i+2]]++
  • ¶

    Normalize all of the numbers by converting them to percentages between 0 and 1.0

        numPixels = @c.pixelData.length / 4

    for i in [0..255]
      levels.r[i] /= numPixels
      levels.g[i] /= numPixels
      levels.b[i] /= numPixels

    levels