... . Note the "most" and "if" in that statement. For perspective correction to work properly, it is important that everything to which the grid is aligned is in the same plane -- in this case the rail top. This means that we can't use the timbers for alignment, because they are in a different vertical plane. Sometimes you can get away with using the timbers in a higher shot (if they are square-on), but not in a low-angle shot such as this. gimp5.png This is the result in Gimp after performing a perspective transform (in Corrective mode). The aspect ratio of length to width is still completely wrong, of course. gimp6.png This is the same thing rotated into the more usual direction for Templot. gimp7.png And here it is loaded into a picture shape in Templot. I have shrunk it vertically and stretched it horizontally to fit the proper aspect ratio using the shift shape corner 2 mouse action. It is easy to get the height correct -- just match the rails to ...