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