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Re: joint histogram of an three channels of an image

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84006] Re: joint histogram of an three channels of an image
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 6 Dec 2007 07:20:47 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <fj89tn$ace$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

there is no function for that -- you can
plot the 3d points corresponding to the colors, i.e.

img = Import["http://blog.wolfram.com/images/people/sw.jpg";]

Graphics3D[
  Map[{RGBColor @@ (#/255), Point[#]} &, img[[1, 1]], {2}]
  ]

Regards
   Jens

vicky Al Aisa wrote:
> hello everyone.
> 
> I wanted to know how can I draw the joint histogram between three
> different channels of an image  in mathematica.
> 
> I have an image , and i want to plot the joint histogram between red,
> green and blue channels of the image.
> I know the underlying method of making the joint histogram between two
> differnt channels ...say red and green, but how can it be poltted for
> all three channels together....is it something like density plot??
> 
> Thankyou
> 
> vicky Al Aisa
> 
> 


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