code: public int get24( int x , int y ) {
  		int i = startIndex + y*stride+x*3;
  		return ((data[i]&0xFF) << 16) | ((data[i+1]&0xFF) << 8) | (data[i+2]&0xFF);
  	}
docs: Returns an integer formed from 3 bands. a[i] << 16 | a[i+1]<<8 | a[i+2]
  
  @param x column
  @param y row
  @return 32 bit integer