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Re: Exporting a bitmap in native resolution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96682] Re: Exporting a bitmap in native resolution
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 20 Feb 2009 05:47:59 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <gnj5jn$iio$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

take the data from the DensityGraphics
and use

ImageMatrixQ[bm_?MatrixQ] := True
ImageMatrixQ[bm_?(MatrixQ[#, VectorQ] &)] := True
ImageMatrixQ[_] := False

MatrixToImage[data_?ImageMatrixQ] :=
  Module[{dim, ny, nx, ch, mind, maxd, colorf},
   dim = Dimensions[data];
   {ny, nx} = Take[dim, 2];
   If[3==Length[dim],
    ch = Last[dim],
    ch = 1
    ];
   colorf = Switch[ch,
     1, GrayLevel,
     2, GrayLevel,
     3, RGBColor,
     4, RGBColor
     ];
   {mind, maxd} = {Min[#], Max[#]} &[Flatten[data]];
   If[Sqrt[#.#]&[{mind,maxd}-Round[{mind,maxd}]]<$MachineEpsilon,
   	{mind, maxd}=Round[{mind, maxd}]
   ];
   If[Abs[maxd-mind]<$MachineEpsilon,
   	maxd=mind+1
    ];
   Graphics[
    Raster[
     Developer`ToPackedArray[data], {{0, 0}, {nx, ny}}, {mind, maxd},
     ColorFunction -> colorf
     ], AspectRatio -> Automatic,
    PlotRange -> {{0, nx}, {0, ny}}, ImageSize -> {nx, ny}
    ]
   ]

the MatrixToImage[] function above.

Regards
   Jens

sibir wrote:
> HI all,
> first I must mention that I am still on 5.2, but I suspect the problem
> is universal. I have a ListDensityPlot which I want to export as a
> bitmap (e.g., png) in native resolution, that is each data point
> yielding one pixel.
> I tried ImageSize and ImageResolution and googled around to no avail.
> Anybody figured out how to do that?
> 
> Thanks, Martin
> 


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