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Unexpected colors
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA

PostPosted: Fri Apr 26, 2013 11:33 pm    Post subject: Unexpected colors Reply with quote

Following the theme of "unexpected colors", and since we haven't a puzzle piece for a while, I offer the following:



In the spirit of disclosing significant changes in postprocessing, I confess that I applied a curves adjustment to increase contrast.

Here is the adjustment:


Pressing the Auto button for curves adjustment removed a lot of the subject's natural background color:



Here is the adjustment producing that image:


And finally, here is the original unadjusted image:


Optical setup was 10X Mitutoyo objective with Thorlabs ITL200 tube lens, to a Canon T1i sensor. The objective was significantly stopped down and the stack was shot at 20 microns step size, only 8 frames, run through Zerene Stacker using DMap. Illumination was halogen, using a single bundle of optical fiber with Kleenex tissue wrapped around its head, the light source positioned about midway along the objective, just far enough off axis to keep the objective from shadowing the subject.

Now the obvious question: what is this beautiful object??

--Rik
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Craig Gerard



Joined: 01 May 2010
Posts: 2877
Location: Australia

PostPosted: Sat Apr 27, 2013 1:46 am    Post subject: Reply with quote

It is beautiful, I look forward to finding out what it is.

Are you shooting through some type of immersion oil?




Craig
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rjlittlefield
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PostPosted: Sat Apr 27, 2013 7:16 am    Post subject: Reply with quote

Craig Gerard wrote:
Are you shooting through some type of immersion oil?

Yes. The subject is not completely smooth, so I added a coverslip with glycerin to fill the gap and avoid direct reflections of the fiber bundle from surface texture.

The Mitutoyo may not the best objective to use for this situation, but I did not realize the problem until I was already set up to shoot with that lens. On the other hand, the Mitutoyo allows illumination closer to the axis than any of my other 10X lenses, which has some importance in bringing out the full intensity of the colors. I shot it only with this one objective, so I'm not sure about all the tradeoffs.

--Rik
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BugEZ



Joined: 26 Mar 2011
Posts: 604
Location: Loves Park Illinois

PostPosted: Sun Apr 28, 2013 4:35 am    Post subject: Reply with quote

Just a guess, but is it egg shell?
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rjlittlefield
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PostPosted: Sun Apr 28, 2013 7:09 am    Post subject: Reply with quote

BugEZ, thanks for the guess!

Nope, not an eggshell.

However (hint #1!), this common material can often be found within a few feet of an eggshell in a typical American kitchen. Very Happy

--Rik
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tpe



Joined: 26 Aug 2007
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Location: Copenhagen Denmark

PostPosted: Sun Apr 28, 2013 11:45 am    Post subject: Reply with quote

Very nice shots, of what must then be bacon?

Tim
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rjlittlefield
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PostPosted: Sun Apr 28, 2013 1:53 pm    Post subject: Reply with quote

Not bacon, but you're very close.

--Rik
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ChrisR
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PostPosted: Sun Apr 28, 2013 2:08 pm    Post subject: Reply with quote

Either a synthetic net thing food comes in, or a section through the rope you use to tether your Vietnamese pot bellied pig?
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rjlittlefield
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PostPosted: Sun Apr 28, 2013 2:31 pm    Post subject: Reply with quote

All guesses appreciated, and I confirm there was a pig involved, but the bacon guess was closer. Smile

--Rik
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seta666



Joined: 19 Mar 2010
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Location: Castellon, Spain

PostPosted: Sun Apr 28, 2013 10:59 pm    Post subject: Reply with quote

I do not see how it could produce this colours but could be lard?
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rjlittlefield
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PostPosted: Sun Apr 28, 2013 11:18 pm    Post subject: Reply with quote

Definitely no one would call this material "lard".

And yet there could be some components of lard involved.

I am not sure!

--Rik
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Olympusman



Joined: 15 Jan 2012
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PostPosted: Mon Apr 29, 2013 7:25 am    Post subject: My guess Reply with quote

chiccarones?
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JW



Joined: 23 Feb 2011
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PostPosted: Mon Apr 29, 2013 8:24 am    Post subject: Reply with quote

Sausage casings?
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rjlittlefield
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PostPosted: Mon Apr 29, 2013 10:33 am    Post subject: Reply with quote

Nope, neither of those, but you're giving me great ideas of other things to look at. Very Happy

The material shown retains much more of its natural structure than chiccarones (fried pork skin). I think that's true for sausage casings too, but I'm not so familiar with how those are processed.

I understand from my readings that the same colors can be found in related products that are completely fresh. I haven't confirmed that personally.

More hints... This stuff is tasty and nutritious, but it's banned by certain religions and ethical standards. I spotted the colors while getting ready to eat and saved out this little piece to photograph. The material does not usually appear as shown here. When the colors are noticed, they often prompt questions about whether the sample is still good to eat.

--Rik
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ChrisR
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PostPosted: Mon Apr 29, 2013 11:23 am    Post subject: Reply with quote

Muscle fibres?
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