...
	Image rimg(r->GetImage());
	
	JPGRaster *jpg = dynamic_cast<JPGRaster*>(~r);
	if(jpg) {
		switch((int)jpg->GetMetaData("orientation")){
			// 1 = natural orientation
			case 2:
				rimg=MirrorHorz(rimg);
				break;
			case 3:
				rimg=Rotate180(rimg);
				break;
			case 4:
				rimg=MirrorVert(rimg);
				break;
			case 5:
				rimg=RotateAntiClockwise(MirrorHorz(rimg));
				break;
			case 6:
				rimg=RotateClockwise(rimg);
				break;
			case 7:
				rimg=RotateClockwise(MirrorHorz(rimg));
				break;
			case 8:
				rimg=RotateAntiClockwise(rimg);
				break;
		}
	}
	img.SetImage(rimg);
...