| Re: PNG output quality degraded after RHEL6 patch [message #86951 is a reply to message #86947] |
Mon, 16 December 2013 17:08   |
Starbuck
Messages: 11
Registered: June 2012
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Junior Member |
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On Monday, December 16, 2013 9:38:39 AM UTC-7, Paul van Delst wrote:
> Hello,
>
>
>
> Disclaimer: I don't think this is an IDL issue, but a PNG (or other)
>
> system library issue.
>
>
>
> My linux (RHEL6) box got patched the other day and, since then, I've
>
> noticed the quality/resolution of the PNG output (via the plot Save
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> method) has degraded.
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>
>
> An example of the plot.Save created graphics post-update is shown here:
>
> http://ftp.emc.ncep.noaa.gov/jcsda/CRTM/.plots/test_png-save .png
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>
>
> A screen capture of the IDL plot window using ImageMagick's import
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> command is shown here:
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> http://ftp.emc.ncep.noaa.gov/jcsda/CRTM/.plots/test_png-scre encapture.png
>
> (sorry - looks like newsreader split the URL)
>
>
>
> As you can see from the latter plot the lines are much smoother. And the
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> latter plot quality is what I was getting with plot.Save in the past,
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> pre-RHEL6-patch.
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>
>
> I've toyed around with various anti-aliasing switches in IDL and what
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> not but the plot image quality in the generated file is still inferior.
>
>
>
> So, I'm posting this message in case someone has managed to figure out
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> what happened to the various system libraries after the upgrade.
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>
>
> Anyone with more sysadmin-y nouse than me got any ideas? ChrisT et al?
>
>
>
> cheers,
>
>
>
> paulv
The suggestions below don't quite fit with the information you provided (since it doesn't sound like you changed the IDL version), but I figured I would throw it out there just in case.
What version of IDL are you using? If you are using IDL 8.2.3, make sure you have installed the patches for this version. The plots might be saved wrong if the 2nd patch is not installed. Do you have any other versions of IDL 8 installed on your system (such as IDL 8.1)? If you do, could you try using a different version to produce your plot and see if the same issue occurs?
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