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MathGroup Archive 1997

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Display and Export of DensityGraphics

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8718] Display and Export of DensityGraphics
  • From: "Gregory A. Garrett" <ggarrett at umich.edu>
  • Date: Fri, 19 Sep 1997 02:47:59 -0400
  • Organization: University of Michigan
  • Sender: owner-wri-mathgroup at wolfram.com

Hello:

I'm using Mathematica 3.0 on a PC platform to create groups of
DensityPlots that I would like to export to make animated GIFs and also
to display in GraphicsArrays.

The problem I have is that I inconsistently get "boarders" on random
sides of the plot.  By "boarders" I mean a row of pixels on one or more
edges of the plot that are a different color than the next row in.

I do not understand why this should happen when the PlotPoints->{x,y}
and ImageSize->{x,y} are integral multiples of each other and the
PlotRange also has the *exact* aspect ratio.

So far I have found that ...
(A) Exporting a graphics cell by Cut&Paste or RightClick/SaveAs/BMP
always gives these boarders. 
(B) After "wrapping" -DensityGraphics- in redundant Graphics[] and
restating PlotRange and ImageSize and AspectRatio I was able toget
Display[file,graphic,"GIF"] to consistantly save a file with no
"boarders".  But this could be a mis-statement in that I might have
instead correct a previous mistake and not noticed.
(C) Creating a 2-D GraphicsArray with GraphicsSpacing->0 gives me these
"boarders" or lines between the different DensityPlots, usually
horizontal.

These leaves me with two questions at this point...
(1) Is there some correction for the aspect ratio of a "Pixel" that I'm
missing?
(2) When I start exporting these DensityPlots to EPS files, am I going
to start finding suprises with the BoundingBox?

Tomorrow I plan I trying a bunch of Rectangle[{,},{,},-DensityGraphic-]
instead of a GraphicsArray.

Wish me luck.  Any comments would be appreciated.

For an example of what I'm talking about, the "flame" aminmation at the
Wolfam Research Web Page Graphics Gallery has a white "boarder" on the
left side I believe.

Gregory Garrett
Graduate Student Research Assistant
University of Michigan


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