/// <summary>
 /// Applies a greyscale filter. For default/NTSC filter use <see cref="Greyscale()"/>
 /// </summary>
 /// <param name="grayScaleOptions">The type of greyscale to apply</param>
 public SimpleFiltersExpression Grayscale(GrayscaleOptions grayScaleOptions)
 {
     builder.SetParameter(SimpleFiltersCommands.Grayscale, grayScaleOptions.ToString().ToLowerInvariant());
     return this;
 }
 /// <summary>
 /// Applies a greyscale filter. For default/NTSC filter use <see cref="Greyscale()"/>
 /// </summary>
 /// <param name="grayScaleOptions">The type of greyscale to apply</param>
 public SimpleFiltersExpression Grayscale(GrayscaleOptions grayScaleOptions)
 {
     builder.SetParameter(SimpleFiltersCommands.Grayscale, grayScaleOptions.ToString().ToLowerInvariant());
     return(this);
 }