Re: Bitmap data extraction (matrix of matrix)

*To*: mathgroup at smc.vnet.net*Subject*: [mg76611] Re: [mg76445] Bitmap data extraction (matrix of matrix)*From*: bsyehuda at gmail.com*Date*: Thu, 24 May 2007 06:22:24 -0400 (EDT)*References*: <200705220654.CAA20101@smc.vnet.net>

Hi, Map[First, RGB, {2}], but notice that the RGB should be set as {{{1, 0, 1}, {2, 3, 2}, {4, 6, 4}, {3, 2, 1}}, {{9, 1, 3}, {3, 2, 1}, {4, 3, 3}, {5, 3, 2}}} and not as you typed yehuda On 5/22/07, mkorneck at nd.edu <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. > > >

**References**:**Bitmap data extraction (matrix of matrix)***From:*mkorneck@nd.edu