-------- Original Message --------
Subject: Re: photos for analysis
Date: Mon, 25 Feb 2008 15:51:05 -0800 (PST)
From: [EMAIL PROTECTED]
To: [email protected]
References: <[EMAIL PROTECTED]>
Hi Matt
I've only had about 8 months experience of geometric morphometrics but I
am dealing with teeth and the enamel has a glare/ shine much like the
shine from your horseshoe crabs. When it comes to the analysis it can be
a real pain sometimes. Unfortunately I've not been able to retake the
photos, but I have thought of the following if you have this problem too.
Try to take the pictures with one solid colour background obviously the
greater difference in colour from your specimen the better; I wish I
could have a different background colour unfortunately the bone coloured
mandible around most of the teeth Im looking at isnt too helpful! Ah
well! but for outline analysis and finding some landmarks a solid
background it handy.
Also try to if you can get filters to put on your light sources you
might find them useful in reducing glare. Im an undergrad so i've never
had the resources to buy something like this nor have I been under
presure to do so. So I do something a lot more basic, using tissue paper
to cover the light source or flash it might be possible to partially
reduce the glare. Im not sure if this will work in your case but it may
help or be worth trying, its a trick a friend taught me as it disperses
the light more evenly while using a flash. You'll have to play with what
paper and what lights to use to make it affective for what you're doing
and whether you use a flash covered or try to use other light sources
covered.
For the top down dorsal view of the specimen would it be possible for
you to rig up some kind of series slats to create a box tight around the
specimen and thus reduce the natural ambient light, and also possibly
mean you might be able remove the rope (provided you deem the box not to
distressing for the animal or that it cant jump out, obviously I've
only dealt with dead things like teeth so don't know!)? By enclose it
youll reduce the glare from the sun and allow you to more directly
control the lighting as well, this might help. Im afraid Im out of
ideas for the side views, bar the solid background colour.
I hope that helps!
Ardern
PS sorry for any spelling errors or mix up in homophones Im dyslexic
and dont notice
Quoting morphmet <[EMAIL PROTECTED]>:
-------- Original Message --------
Subject: Re: photos for analysis
Date: Mon, 25 Feb 2008 12:40:11 -0800 (PST)
From: Luiz Ernesto Costa Schmidt <[EMAIL PROTECTED]>
To: [email protected]
References: <[EMAIL PROTECTED]>
Dear Matt;
The photos are preatty nice. But I have some comments about them:
1. I miss some reference scale;
2. You are wright about the lightning. If you culd have amore
homogeneous source of light it will be better;
3. You have some problem with the animal position in some photos. Like
photo 21 is perfect (in my opinion), but photo 27 the animal do not
seems to be centered;
4. I didnt follow how are you holding the camera. Is it fixed in some
tripod in a specific distance?
5. The level of the camera in some lateral view photos seems to have an
undesired view of both dorsal part and lateral part of the specimen.
This could be solved by placing a removable mark in the uppermost part
of the animal. While you keep seeing this mark in the photo, you are
still having this undesired mixture of both lateral and dorsal view.
I hope this comments will help you.
Cheers.
Ernesto.
2008/2/25, morphmet <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>:
-------- Original Message --------
Subject: photos for analysis
Date: Mon, 25 Feb 2008 12:02:39 -0800 (PST)
From: Matt Smith <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
To: [email protected] <mailto:[email protected]>
Hi folks,
Thanks so much for the advice on using a copy stand - I had pieced
together some other contraption that wasn't nearly as nice.
I took a few pictures this weekend and I was hoping to receive some
feedback / critical evaluation on their appropriateness. Would these
work for shape and size analysis? Is anything missing? Does the
lighting need to be more even? Are the angles okay? Etc., etc.
Again, thanks in advance, you all are great!
http://www.zoo.ufl.edu/madsmith/index/Photos.html
-Matt
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Luiz Ernesto Costa Schmidt
Núcleo de Aracnologia - Departamento de Genética
Universidade Federal do Rio Grande do Sul
Av. Bento Gonçalves, 9500 - Prédio 43323 - Sala 205
Porto Alegre, RS/Brasil. CEP 91501-970
Fone: ++55 51 33086732
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For more information visit http://www.morphometrics.org
