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value=GetImageArtifact(image,"png:compression-filter");
  if (value == NULL)
     value=GetImageOption(image_info,"png:compression-filter");
  if (value != NULL)
  {

      /* To do: combinations of filters allowed by libpng
       * masks 0x08 through 0xf8
       *
       * Implement this as a comma-separated list of 0,1,2,3,4,5
       * where 5 is a special case meaning PNG_ALL_FILTERS.
       */

      if (LocaleCompare(value,"0") == 0)
        mng_info->write_png_compression_filter = 1;

      if (LocaleCompare(value,"1") == 0)    // <--------------    SHOULDNT THERE BE AN 'ELSE' HERE?  VALUE 0 FALLS THROUGH TO THE EXCEPTION
        mng_info->write_png_compression_filter = 2;

      else if (LocaleCompare(value,"2") == 0)
        mng_info->write_png_compression_filter = 3;

      else if (LocaleCompare(value,"3") == 0)
        mng_info->write_png_compression_filter = 4;

      else if (LocaleCompare(value,"4") == 0)
        mng_info->write_png_compression_filter = 5;

      else if (LocaleCompare(value,"5") == 0)
        mng_info->write_png_compression_filter = 6;


      else
        (void) ThrowMagickException(&image->exception,
             GetMagickModule(),CoderWarning,
             "ignoring invalid defined png:compression-filter",
             "=%s",value);
    }