Page 200 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed

Chapter 6: Photogrammetric Techniques 179
Figure 6.6 Rectification table used to rectify photographs under an enlarger. Most darkroom techniques have now been replaced with digital imagery, particularly the rectification of tilt can be managed more quickly and efficiently with programs like Photoshop rather than the cumbersome and time-consuming darkroom methods.
feather-edged so that half of the overlap is discarded. This is then placed on the mounted print so that the flight lines correspond and adjusted until the two prints match at the join. This process is continued in all four direc- tions from the central print. This system is extremely effective provided the rules are adhered to exactly. It is, however, time-consuming and, as a result, tends to be abandoned in favor of the ad hoc uncontrolled system.