this.labelCanvas = new Picture (this.photoPic.getWidth(), this.photoPic.getHeight()+30);
    int fontsize= 15;
    labelCanvas.drawCenteredString(this.caption, this.photoPic.getHeight()+20, fontsize);
    labelCanvas.copyPictureTo(this.photoPic,0,0);
    this.photoPic = labelCanvas;