RGBEByteToRGBFloat = function ( sourceArray, sourceOffset, destArray, destOffset ) {

		var e = sourceArray[ sourceOffset + 3 ];
		var scale = Math.pow( 2.0, e - 128.0 ) / 255.0;

		destArray[ destOffset + 0 ] = sourceArray[ sourceOffset + 0 ] * scale;
		destArray[ destOffset + 1 ] = sourceArray[ sourceOffset + 1 ] * scale;
		destArray[ destOffset + 2 ] = sourceArray[ sourceOffset + 2 ] * scale;

	}
@author Prashant Sharma / spidersharma03
@author Ben Houston / http://clara.io / bhouston