Hi Marta- With regard to obtaining linear measures from photographs, I have an addition to Andrea's suggestions of using TPSDig to get landmark data first.
I have a piece of software on my website (http://www.canisius.edu/~sheets/morphsoft) called TradMorphGen which will compute any requested set of interlandmark distances from a properly scaled set of landmark measurements. It will load data in the IMP file format I use, or TPS files. This is all freely distributed academic software, it might prove helpful. -Dave //------------------------------------------------------------------------------------// Dr. H. David Sheets Professor, Dept. of Physics Adjunct Associate Professor Canisius College Dept. of Geology 2001 Main St SUNY at Buffalo Buffalo, NY 14208 Amherst, NY 14260 (716) 888-2587 http://www.canisius.edu/~sheets IMP geometric Morphometrics software suite at http://www.canisius.edu/~sheets/morphsoft.html //-----------------------------------------------------------------------------------// == Replies will be sent to list. For more information see http://life.bio.sunysb.edu/morph/morphmet.html.
