Bitmap data extraction (matrix of matrix)

*To*: mathgroup at smc.vnet.net*Subject*: [mg76445] Bitmap data extraction (matrix of matrix)*From*: mkorneck at nd.edu*Date*: Tue, 22 May 2007 02:54:57 -0400 (EDT)

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.

**Follow-Ups**:**Re: Bitmap data extraction (matrix of matrix)***From:*bsyehuda@gmail.com

**Re: Bitmap data extraction (matrix of matrix)***From:*János <janos.lobb@yale.edu>

**Re: Bitmap data extraction (matrix of matrix)***From:*Sseziwa Mukasa <mukasa@jeol.com>

**Re: Bitmap data extraction (matrix of matrix)***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>