Need faster way to combine arrays
- To: mathgroup at smc.vnet.net
- Subject: [mg36045] Need faster way to combine arrays
- From: Kevin Gross <kcgross at sbcglobal.net>
- Date: Wed, 14 Aug 2002 05:35:13 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
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.