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MathGroup Archive 2005

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Re: Beginner : how to convert .bmp or .jpeg for digital processing

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57157] Re: [mg57129] Beginner : how to convert .bmp or .jpeg for digital processing
  • From: Clifford Martin <camartin at snet.net>
  • Date: Thu, 19 May 2005 03:08:35 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Peter,

I hope this is what you want.

Here is an example of a digital picture(jpeg)
converted to be able to manipulate the data.

gig =
Import["E:\\pup\\data\\41205data375midata\\D056_\
41105_P_8mmfromEnd1a.jpg", "JPEG"]; 
Dimensions[gig]
step = gig[[1,1]]; 
rat = step[[Range[512],Range[512],1]]; 
Dimensions[rat]

first I import the file. JPEG is set up to have 3
different colors so you have to get down to manipulate
it to one. So step and rat takes the first color. The
dimensions of rat are 512 by 512. Now I can manipulate
the file doing edge enhancement, etc.  Hope this
helps.

Cliff

--- Peter van Daalen <vandaalen at chello.nl> wrote:
> I want a simple way of processing grayscale and .bmp
> and .jpeg bytes ( 
> for improving my digitized X-ray pics ).
> No advanced processing as per application " Digital
> Image Processing " 
> is needed for me.
> 
> Being a Mathematica beginner, I failed in finding
> the way to convert 
> ..jpeg and .bmp formats into 2D and 3D numerical (
> 0-255) arrays.
> 
> Thanks for any help.
> 
> 


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