Re: Bitmap data extraction (matrix of matrix)
- To: mathgroup at smc.vnet.net
- Subject: [mg76547] Re: [mg76445] Bitmap data extraction (matrix of matrix)
- From: DrMajorBob <drmajorbob at bigfoot.com>
- Date: Wed, 23 May 2007 05:45:58 -0400 (EDT)
- References: <21421943.1179846746296.JavaMail.root@m35>
- Reply-to: drmajorbob at bigfoot.com
I think you mean 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}}}; Map[First, rgb, {2}] {{1, 2, 4, 3}, {9, 3, 4, 5}} Bobby On Tue, 22 May 2007 01:54:57 -0500, <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. > > > -- = DrMajorBob at bigfoot.com