Re: Fwd: Colour Quantification

Posted by Stephan Saalfeld on Apr 07, 2009; 11:53am
URL: http://imagej.273.s1.nabble.com/Fwd-Colour-Quantification-tp3693066p3693068.html

Ouch!  I have to blame me an idiot ;)  The first part sounds reasonable,
but the solution is wrong.

Will take me some more minutes to come up with something ...

Best regards,
Stephan


On Tue, 2009-04-07 at 13:27 +0200, Stephan Saalfeld wrote:

> Hi Samatis,
>
> if there is only "brown" in the image.  The intensity itself is the
> "amount of color".  If you have more colors and just the "brown" has
> meaning for you, you would have to make "brown" an explicit axis of
> your
> color space which is just a linear transformation.  Since you are not
> interested in the other components of this color space, you can
> estimate
> the "amount of brown" of an rgb-color c by
>
> amount_of_brown =
>   c.red / brown.red +
>   c.green / brown.green +
>   c.blue / brown.blue
>
> Blame me an idiot if this is wrong ;)
>
> Best regards,
> Stephan
>
>
> On Tue, 2009-04-07 at 13:32 +0300, S. Pagakis wrote:
> > Hello
> >
> > We would like to quantify the "amount" of a colour.
> >
> > We have two RGB pictures in which an area appears brown and
> another  
> > one lighter brown and our experiment will produce a series of
> > "brown"  
> > intensities in between.
> >
> > We know the ImageJ tools which measure RGB intensity, but
> expressing  
> > the two areas as RGB intensities does not produce something  
> > "meaningful" which can be graphed.
> >
> > Has anyone used a specific methodology (or has a plugin) which can  
> > quantify this in another way?  Possibly converting the RGB into  
> > another colour space?
> >
> > Regards
> >
> > Samatis Pagakis
> >
> >
> > *********************************
> > Stamatis Pagakis Ph.D.
> > Biological Imaging Unit
> > Biomedical Research Foundation, Academy of Athens
> > Soranou Efessiou 4, Athens 115 27 - Greece
> > M:     [phone]
> > W:     [phone]
> > FAX: [phone]
> > http://www.bioacademy.gr/Faculty/core.php?cr=17