dataR = (unsigned char**)malloc(H);

  if(number_of_bytes = 3) {
    dataG = (unsigned char**)malloc(H);
    dataB = (unsigned char**)malloc(H);
  }

  for(int i = 0; i < H; ++i) {
      dataR[i] = (unsigned char*)malloc(W);
      if(number_of_bytes = 3) {
        dataG[i] = (unsigned char*)malloc(W);
        dataB[i] = (unsigned char*)malloc(W);
      }
  }