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Re: Resizing Graphics

• To: mathgroup at smc.vnet.net
• Subject: [mg36357] Re: Resizing Graphics
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Tue, 3 Sep 2002 01:40:58 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <akn0lk$llm$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

take the matrix of gray values or the matrix of the color channels,
apply ListInterpolation[] and generate a resampled table with
the interpolated function.

Regards
  Jens

Aaron wrote:
> 
> I was wondering if there is a method for resizing Raster graphics
> (resizing the actual matrix of pixels, not just the display size).  I
> am processing a large number of JPEG images, and we sometimes need to
> reduce the image size to allow data processing algorithms to function
> without running out of memory.  In the past we simply used a program
> such as Photoshop to resize them before importing them into
> Mathematica.  Due to the number of images we are processing now this
> is very inconvenient and it would be very useful if there was a method
> for accomplishing it in Mathematica, but I can't find one.  I also
> thought about doing something simple like sampling every few pixels or
> averaging, but I thought there might be a method with more efficacy
> than this. I also tried exporting the graphics with the Export command
> as new JPEGs and manipulating the ImageResolution and ImageSize
> options but this seemed to have no effect.  Any help would be much
> appreciated.
> Thanks,
> Aaron Urbas