RE: centroid size and different distances from the object

[morphmet]

-------- Original Message --------
Subject: RE: centroid size and different distances from the object
Date: Mon, 16 Nov 2009 16:23:50 GMT
From: Camp, Jessica A <jessica-c...@uiowa.edu>
To: morphmet@morphometrics.org <morphmet@morphometrics.org>
References: <4b016462.2010...@morphometrics.org>

Tina,
If you put your pictures into a program like tpsDig, you can measure a 
set length on screen. If you use tpsDig, click on the button with the 
hammer (it's called image tools). In the measure tab of the window that 
pops up, you can type in the length of the skull you're currently 
looking at, then measure it out on screen. If you haven't used it 
before, you'll also need to download tpsUtil to compile your pictures 
into files compatible with the program. If you use something outside the 
tps package to calculate centroid size, convert your files from .tps to 
.txt . You can also go about it differently by using a program like 
Photoshop to increase or decrease the zoom on your pictures so that 
they're all the same. It's been a while since I've done that and I don't 
remember the details of how to actually do it.
And of course, in the future, always stick in a scale. ;)
Hope this helps,
Jessica Camp
________________________________________
From: morphmet [morphmet_modera...@morphometrics.org]
Sent: Monday, November 16, 2009 8:40 AM
To: morphmet
Subject: centroid size and different distances from the object

-------- Original Message --------
Subject:        centroid size and different distances from the object
Date:   Mon, 16 Nov 2009 11:06:26 GMT
From:   tina klenovsek <tina_klenov...@yahoo.com>
To:     morphmet@morphometrics.org




Please help!

I have a collection of photos of mammal skulls that I took for
morphometric analysis. But now I got new specimens of the same
species that I would like to include into the already mentioned analysis.

The problem is, I can't photograph new specimens under the exact
conditions I photographed the first. Especially the DISTANCE of the
camera from the skull is the problem. I can't photo the old again
because they have been borrowed from many different museums and have
already been returned.

What shall I do? I need to calculate CENTROID SIZE for all specimens. Is
this possible? I also don't have any scale on the old photos, but I know
the exact length and width of every skull, is this enough?

Please help me. I don' want all my old photos to go to waste.

Thank you in advance!

Tina






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