I have had this problem with tpsDIG and found that when I move from one specimen to the next, as long as I readjust the focus in some way prior to digitizing the first landmark, it works fine (i.e., the landmark positions reconfigure with the size of the specimen as I zoom in and out). I have also noticed that usually clicking the focus, either + or -, initially has a drastic effect on the resizing of the image, implying to me that the initial image might be a thumbnail. I should note that in my case, I have worked with saved 35 mb images from a camera lucida on a dissecting scope, so the full size image can be quite large on the monitor. It seems that tpsdig fits the image to the screen, initially, but as soon as I click "=" or "-" tpsdig zooms to full image size, which exceeds the monitor dimensions. However, I have found this essential as an exercise (go to full size, then zoom out) to eliminate the problem you described.
I recommend that you try arbitrarily resizing the image before you record landmarks and then resize again after you record landmarks to see if this solves the problem. It worked for me. Good Luck! Mike Collyer At 12:02 PM 10/20/2006, you wrote: > > > morphmet wrote: > > >> Hello, morphmet list, > > >> > > >> When I zoom in and out in tpsDIG, the dots shift. This defeats the > > >> purpose, obviously, so I'm guessing I'm either missing a function > > >> that the program offers, or else the idea is that one > > shouldn't place > > >> landmarks on different parts of the same image at different > > >> magnifications. (The specimens are helically coiled snail > > shells, and > > >> the features in the earlier whorls - though putatively > > homologous - > > >> are vastly tinier than in the later coils, so being able > > to zoom in > > >> at the top would really help.) Can someone shed some light on this? > > >> > > >> Thanks, > > >> Leah Reilly > > >> (CUNY EEB Ph.D. student) > > >> > > >> Michael Collyer Postdoctoral Research Associate Iowa State University Department of Ecology, Evolution, and Organismal Biology 234 Bessey Hall Ames, IA 50011 Phone: 515 294-1968 Email: [EMAIL PROTECTED] -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
