question: public static void writeImageToPpm ( int [ ] [ ] image , String ppmFileName ) throws IOException { try ( BufferedWriter ppmOut = new BufferedWriter ( new FileWriter ( ppmFileName ) ) ) { int rows = image . length ; int cols = image [ 0 ] . length ; ppmOut . write ( "P3\n" ) ; ppmOut . write ( "" + rows + " " + cols + " 255\n" ) ; for ( int [ ] anImage : image ) { StringBuilder s = new StringBuilder ( ) ; for ( int j = 0 ; j < cols ; j ++ ) { s . append ( anImage [ j ] + " " + anImage [ j ] + " " + anImage [ j ] + "  " ) ; } ppmOut . write ( s . toString ( ) ) ; } } }
target:  Writes the given image in the given file using the PPM data format.