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"This copy of gnuplot cannot read png/gif/jpeg images" problem

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Subject	"This copy of gnuplot cannot read png/gif/jpeg images" problem
From	Rich Cook <wealthychef@gmail.com>
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Hello, I am in charge of installing and maintaining gnuplot on our clusters and am by no means an expert.  Our user has reported the following is occurring: 

gnuplot> plot 'test.png' binary filetype=png with rgbimage
         This copy of gnuplot cannot read png/gif/jpeg images


After googling a bit, I have looked in the build log for PNG entrails and see the following: 


checking for gdlib-config... /usr/bin/gdlib-config
checking for gdImageCreateTrueColor in -lgd... yes
checking gd.h usability... yes
checking gd.h presence... yes
checking for gd.h... yes
checking for gdImageGif in -lgd... yes
checking for gdImageGifAnimBegin in -lgd... yes
checking for gdImageJpeg in -lgd... yes
checking for gdImageStringFT in -lgd... yes
checking for gdImagePng in -lgd... yes

...

  jpeg terminal: yes
  gif terminal: yes (with animated gif)
  png terminal: yes
    (jpeg, gif and png terminals can use TTF fonts)
  pdf terminal: no (requires libpdf)
...

  cairo-based pdf and png terminals: yes 



I don';t understand why gnuplot thinks it cannot handle png files.  Can someone help me debug this one?  
Thanks.

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Thread

"This copy of gnuplot cannot read png/gif/jpeg images" problem Rich Cook <wealthychef@gmail.com> - 2013-05-20 19:15 -0700
  Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem Rich Cook <wealthychef@gmail.com> - 2013-05-20 19:17 -0700
  Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem sfeam <sfeam@users.sourceforge.net> - 2013-05-20 22:15 -0700
    Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem Rich Cook <wealthychef@gmail.com> - 2013-05-21 09:13 -0700
      Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem Rich Cook <wealthychef@gmail.com> - 2013-05-21 09:16 -0700
        Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem Rich Cook <wealthychef@gmail.com> - 2013-05-21 09:49 -0700
      Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem sfeam <sfeam@users.sourceforge.net> - 2013-05-21 11:52 -0700
        Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem Rich Cook <wealthychef@gmail.com> - 2013-05-23 09:44 -0700
  Re: "This copy of gnuplot cannot read png/gif/jpeg images" problem ab <ab.3942@googlemail.com> - 2013-05-22 00:20 -0700

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