code: public static function getPixelValue($size)
  	{
  		@trigger_error('Using Image::getPixelValue() has been deprecated and will no longer work in Contao 5.0.', E_USER_DEPRECATED);
  
  		$value = preg_replace('/[^0-9.-]+/', '', $size);
  		$unit = preg_replace('/[^acehimnprtvwx%]/', '', $size);
  
  		// Convert 16px = 1em = 2ex = 12pt = 1pc = 1/6in = 2.54/6cm = 25.4/6mm = 100%
  		switch ($unit)
  		{
  			case '':
  			case 'px':
  				return (int) round($value);
  				break;
  
  			case 'em':
  				return (int) round($value * 16);
  				break;
  
  			case 'ex':
  				return (int) round($value * 16 / 2);
  				break;
  
  			case 'pt':
  				return (int) round($value * 16 / 12);
  				break;
  
  			case 'pc':
  				return (int) round($value * 16);
  				break;
  
  			case 'in':
  				return (int) round($value * 16 * 6);
  				break;
  
  			case 'cm':
  				return (int) round($value * 16 / (2.54 / 6));
  				break;
  
  			case 'mm':
  				return (int) round($value * 16 / (25.4 / 6));
  				break;
  
  			case '%':
  				return (int) round($value * 16 / 100);
  				break;
  		}
  
  		return 0;
  	}
docs: Convert sizes like 2em, 10cm or 12pt to pixels
  
  @param string $size The size string
  
  @return integer The pixel value
  
  @deprecated Deprecated since Contao 4.3, to be removed in Contao 5.0.
  Use the contao.image.image_factory service instead.