Re: Assessing bird colouration

Posted by Gary Sellani on Dec 20, 2010; 12:22am
URL: http://imagej.273.s1.nabble.com/Assessing-bird-colouration-tp3686141p3686144.html

I think this would be possible IF you could process the raw image from the camera.

-----Original Message-----
From: Robert Dougherty <[hidden email]>
Sender: ImageJ Interest Group <[hidden email]>
Date: Sun, 19 Dec 2010 15:58:47
To: <[hidden email]>
Reply-To: ImageJ Interest Group <[hidden email]>
Subject: Re: Assessing bird colouration

Gabriel,

Ericson seems to have based his analysis on a 3-D color space "designed to fit the human perception of color hues."  Since the RGB / HSB color space used in ImageJ is also presumably oriented around human perception, is it possible that an RGB image might be sufficient in this particular case?  I'm suggesting that if the illumination and the RBG filters in the camera and everything else were lined up correctly, that it might be possible to get equivalent results.  Even if the color values did not exactly match Ericon's, they still might be rich enough to classify  Hoopoes by sex and subspecies.

Bob


On Dec 19, 2010, at 12:21 PM, Gabriel Landini wrote:

> On Sunday 19 December 2010 19:38:18 Ross Ahmed wrote:
>> In the paper above, the spectrometer was used to analyse the colouration of
>> museum specimens of Hoopoe (i.e. the birds are dead/stuffed). Is it possible
>> to generate similar results by analysing a photo of a dead/stuffed Hoopoe
>> using Image J?
>
> Do you mean using an RGB image? No, you can't.
> You need spectrophotometer or a multispectral setup (for example a camera with
> a tunable filter or a collection of band pass filters).
> Cheers
> Gabriel

Robert Dougherty, Ph.D.
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