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MathGroup Archive 2007

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Re: listdensityplot, black box?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74860] Re: listdensityplot, black box?
  • From: "Szabolcs" <szhorvat at gmail.com>
  • Date: Mon, 9 Apr 2007 06:08:40 -0400 (EDT)
  • References: <ev7j5d$l36$1@smc.vnet.net>

On Apr 7, 10:01 am, "alexxx.ma... at gmail.com" <alexxx.ma... at gmail.com>
wrote:
> I have a rectangular grid of data (249x400) in the simple form of
> values 0/1, e.g:
> {{1, 1, 0, ......, 1, 1, 1, 0, 0, 0, 0}, ... }
>
> I read them with
>
> - lab=Import["...image.pbm"]
>
> - lab2 = lab[[1, 1]]
>
> and Show[Graphics[Raster[lab2]]] shows the image OK.
>
> Now, whenever I do:
>
> - ListDensityPlot[lab2]
>
> I get no errors, but a completely black plot - of the correct size
> 249x400, however.
>
> I played a little with ColorFunction and ColorOutput, but it didnt
> help.
>
> Do you have any idea what I'm doing wrong???
>
> thanks for any help...
>
> Alessandro Magni

With ListDensityPlot, every pixel has a border. If the mesh is too
dense, all you see is this border because the pixels get too small.
Use the option Mesh->False.



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