code: function identity(resultArg) {
    var result = resultArg || {};
    result.colorOffset = result.colorOffset || vec4.create();
    result.colorMatrix = result.colorMatrix || mat4.create();
    return result;
  }
docs: Helper functions for color transformation {@link Effects}.
  
  References:
  
  - [ColorMatrix Guide](http://docs.rainmeter.net/tips/colormatrix-guide)
  - [Matrix Operations for Image Processing](http://www.graficaobscura.com/matrix/index.html)
  - [WebGLImageFilter](https://github.com/phoboslab/WebGLImageFilter)
  - [glfx.js](https://github.com/evanw/glfx.js)
  
  @namespace colorEffects
   
  A vector and matrix corresponding to an identity transformation.
  
  @param {Object} result Object to store result
  @param {vec4} result.colorOffset Array with zeroes.
  @param {mat4} result.colorMatrix Identity matrix.
  
  @memberof colorEffects