working png output from graphing modules

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  • john
    #1

    working png output from graphing modules

    Are there any charting or graphing modules for python that can write
    PNG, JPEG, or GIF graphics? I have found a couple of nice looking
    packages that can make beautiful postscript, PDF, or SVGs (PyChart and
    ReportLab) but they can't make PNGs, GIFs, or JPEGs. (On my Solaris
    machine with Python 2.2 they don't.) Or are there any simple UNIX
    filters to convert SVG, PDF, or ps files to PNG?
    Tags: None
    • Robin Becker
      #2
      Re: working png output from graphing modules

      In article <983dac9b.03092 21905.1960cf02@ posting.google. com>, john
      <johnlichtenste in@mac.com> writes[color=blue]
      >Are there any charting or graphing modules for python that can write
      >PNG, JPEG, or GIF graphics? I have found a couple of nice looking
      >packages that can make beautiful postscript, PDF, or SVGs (PyChart and
      >ReportLab) but they can't make PNGs, GIFs, or JPEGs. (On my Solaris
      >machine with Python 2.2 they don't.) Or are there any simple UNIX
      >filters to convert SVG, PDF, or ps files to PNG?[/color]
      ReportLab certainly makes png/gif/jpeg, but only if you build the
      _renderPM extension and also PIL. I know that's possible with solaris 8
      as I have done it myself, but haven't done much with later versions.
      There's also a requirement to get appropriate T1 font files.
      --
      Robin Becker

        Comment

        • Tim Evans
          #3
          Re: working png output from graphing modules

          johnlichtenstei n@mac.com (john) writes:
          [color=blue]
          > Are there any charting or graphing modules for python that can write
          > PNG, JPEG, or GIF graphics? I have found a couple of nice looking
          > packages that can make beautiful postscript, PDF, or SVGs (PyChart and
          > ReportLab) but they can't make PNGs, GIFs, or JPEGs. (On my Solaris
          > machine with Python 2.2 they don't.) Or are there any simple UNIX
          > filters to convert SVG, PDF, or ps files to PNG?[/color]

          The 'convert' utility from ImageMagick (google for it) is very good at
          converting PDF or PS to PNG. It uses ghostscript to do the actual
          conversion; it's just very good at choosing the right options to pass
          to ghostscript.

          convert -geometry 800x600 -density 200 foo.ps foo.png

          Will convert a postscript to a png, keeping the aspect ratio correct
          but making it fit inside an 800 by 600 pixel area. The -density
          argument tells it the dpi to use when rendering the image. Higher
          values are slower but give better results.

          --
          Tim Evans

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