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Re: Need faster way to combine arrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg36067] Re: Need faster way to combine arrays
  • From: Selwyn Hollis <slhollis at earthlink.net>
  • Date: Thu, 15 Aug 2002 02:36:18 -0400 (EDT)
  • References: <ajd7sn$ekc$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Something like this?

    Partition[Transpose[Flatten/@{r, g, b}], 2]

---
Selwyn Hollis



Kevin Gross wrote:
> Hello all,
> 
> I've been using Mathematica for a while, but only recently for image 
> processing.  Suppose I have the following 2D intensity arrays:
> 
> r={{a1,b1},{c1,d1}};
> g={{a2,b2},{c2,d2}};
> b={{a3,b3},{c3,d3}};
> 
> Now I'd like to combine them to produce a color image.
> 
> color=Table[{r[[i,j]],g[[i,j]],b[[i,j]]},{i,2},{j,2}]
> 
> This returns
> 
> {{{a1, a2, a3}, {b1, b2, b3}}, {{c1, c2, c3}, {d1, d2, d3}}}
> 
> which can be viewed as a color image with
> 
> Graphics[Raster[color,ColorFunction->RGBColor]]//Show
> 
> When the 2D arrays are large, combining them to form the color tensor as 
> above is very time consuming.  Surely there is a more efficient, clever 
> way to combine them than my use of Table, right?
> 
> Many thanks,
> 
> Kevin Gross
> 
> PS Any comments pro/con from users of the Digital Image Processing 
> package are also welcome.
> 


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