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	public enum ColourType {		Greyscale,		Truecolour,		Indexed_colour,		Greyscale_with_alpha,		Truecolour_with_alpha,		Invalid;				public static ColourType byteToColourType(byte b){			switch (b) {				case 0: return ColourType.Greyscale;				case 2: return ColourType.Truecolour;				case 3: return ColourType.Indexed_colour;				case 4: return ColourType.Greyscale_with_alpha;				case 6: return ColourType.Truecolour_with_alpha;				default: return ColourType.Invalid;			}		}				public String toString () {	        return super.toString().replace('_', ' ');	    }	}		public enum InterlaceMethod {		No_Interlace {public String toString(){return "No interlace";}},		Adam7,		Invalid	}