public void increaseDpi(){
  if (this.currentDpiPos < (this.dpiSizes.length - 1)) {
    ++this.currentDpiPos;
  }
}

public void increaseDpi ( ) { if ( this . currentDpiPos < ( this . dpiSizes . length - 1 ) ) { ++ this . currentDpiPos ; } }
increase the image size ( dpi ) .
