Re: Exporting Density Plots -- one pixel per point?

*To*: mathgroup at smc.vnet.net*Subject*: [mg64375] Re: [mg64344] Exporting Density Plots -- one pixel per point?*From*: "Yasvir A. Tesiram" <tesiramy at omrf.ouhsc.edu>*Date*: Tue, 14 Feb 2006 01:32:06 -0500 (EST)*References*: <200602130815.DAA12543@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, As a first suggestion I would say, work with off-screen graphics (i.e. set option DisplayFunction -> Identity). Here is one example, on a Centrino 2.0GHz laptop, 1GB RAM, Mathematica 5.2, Linux kernel 2.6. d = Partition[Table[i, {i, 3000*3000}], 3000]; In[8]:= Length[d] Out[8]= 3000 In[11]:= fig=ListDensityPlot[d,Mesh -> False, DisplayFunction -> Identity, PlotRange -> All];//Timing Out[11]= {0.000999 Second,Null} (* I imagine that using custom colour functions for so many pixels will up the time a great deal *) In[13]:= Export["example.tif",fig,"TIFF"];//Timing Out[13]= {12.6071 Second,Null} The output looked OK to me on GIMP. Good luck. Sounds like some pretty smick imaging to me. Yas > Hello, > > I wish to generate large bitmaps (tiffs, say) where each the greyscale > color value of each pixel is determined by a given function of x and y. > By large, I mean more than 9E6 pixels. > > I've tried using a density plot for this, and then a rasterized table, > but I run into a couple of difficulties. First, if I use pixel counts > which approach this order of magnitude, I get memory errors -- on a > win32 machine with 2GB installed. Second, if I make do with a smaller > pixel count, I have trouble exporting the plot in a truly > one-pixel-per-data-point fashion. (The process is time consuming, and > results are unconvincing). > > I think the problem is the way Mathematica internally tries do > everything in a resolution independent way, which I don't want here. > > Ideas? > Questions? > > (The specific application is to generate high resolution print-outs of > holographic patterns which can later be imaged to photographic film. > After appropriate development and bleaching, the exposed film can be > used as a transmission hologram to couple gaussian laser beams into > other interesting modes.) > > Thank you. >

**References**:**Exporting Density Plots -- one pixel per point?***From:*"quintessentialk" <quintessentialk@gmail.com>