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MathGroup Archive 2007

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Re: Bitmap data extraction (matrix of matrix)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76514] Re: Bitmap data extraction (matrix of matrix)
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 23 May 2007 05:28:48 -0400 (EDT)
  • References: <f2u51n$k09$1@smc.vnet.net>


Hi Mike,

ther is a mistake in the definition of RGB, it should read:

RGB={{1,0,1},{2,3,2},{4,6,4},{3,2,1},{9,1,3},{3,2,1},{4,3,3},{5,3,2}}

the you can get all the first,R, elements by e.g.:

rgb[[All,1]]

hope this helps, Daniel



mkorneck at nd.edu wrote:

> Hello,

> 

> This is most likely a simple question for those who use Mathematica on

> a semi-regular basis, but ...

> 

> I have a 512x512 matrix composed of 1x3 matrix elements, and want to

> create a 512x512 matrix composed of a single value in the original 1x3

> elements.

> 

> That doesn't look very well defined, so please let me explain further

> in the hopes of clarifying what I am after.

> 

> It's a bitmap image file (512x512) and I want to extract a part of the

> "raw" data for further processing. The raw data in the original file

> consists of values for the red, green and blue (RGB). I would like to

> create a matrix composed of only the *red* values across the 512x512

> array.

> 

> As a simplified example ....

> 

> Given RGB = {{1,0,1},{2,3,2},{4,6,4},{3,2,1}}

>                     {{9,1,3},{3,2,1},{4,3,3},{5,3,2}}

> 

> 

> I would like to end up with R = {1,2,4,3}

>                                             {9,3,4,5}

> 

> Thank you for your time,

> 

> Mike K.

> 

> 




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