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MathGroup Archive 2001

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2 questions about bitmap images

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28677] 2 questions about bitmap images
  • From: "Barthelet, Luc" <lucb at ea.com>
  • Date: Tue, 8 May 2001 02:51:14 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

1) I would like to use Raster to display a bitmap in a graphic, but I would
like some of the values of the bitmap to not be displayed (100% transparent
pixels).
I have been able to achieve this by writing my own version of Raster that
draw each pixel as a rectangle, but I would like to know if there is a way
to get the regular Raster to do it. I hate to carry around my own version of
Mathematica functions.

2) I am starting to use the "Digital Image Processing" application add-on.
Has anyone figured out how to take a graphic generated by a previous Show
command and turn it into an "ImageData" structure? It seems there should be
a way to do it using the usual Display or maybe even Export?
I'd rather not have to write a file and then read it back.

Thanks,

Luc

"Things well understood are explained well!"



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