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MathGroup Archive 1996

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Re: Importing gif, tiff... (etc) as an array (summary)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4934] Re: Importing gif, tiff... (etc) as an array (summary)
  • From: Adriano Barenco <barenco at ph.ox.ac.uk>
  • Date: Fri, 4 Oct 1996 00:18:01 -0400
  • Organization: Oxford University
  • Sender: owner-wri-mathgroup at wolfram.com

Many thanks to all those who answered,

To sum up the answers to my request:
 
>On the Mac, at least, you can simply
>- paste the graphic you want from another application
>- select the graphics cell
>- select the "Convert To InputForm" option from the Graph menu
>- assign the Raster[] data in the generated cell to a variable (and/or 
>save the data to disk
> 
>The Raster[] object contains the pixel data you want and has just the 
>resolution of the pasted image.

(suggested by  Harald Berndt <hberndt9 at mail.idt.net>)

>One route (on Unix) would be to use the PBMPlus package (or its
>successor NetPBM) and use its filters to produce an ASCII array, which
>you could then read in Mma.  There are many variations in those image
>formats, and I would not care to reinvent that particular wheel in
>Mma.  Your command line to convert a GIF to gray scale would look like
> 
>giftoppm testcase.gif | ppmtopgm | pnmnoraw > testcase.asc

(suggested by Hal Mueller <halm at heart.cor.epa.gov>)

Adriano Barenco

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