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PNG output quality degraded after RHEL6 patch [message #86947]

Mon, 16 December 2013 08:38

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

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
method) has degraded.

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

A screen capture of the IDL plot window using ImageMagick's import
command is shown here:
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
latter plot quality is what I was getting with plot.Save in the past,
pre-RHEL6-patch.

I've toyed around with various anti-aliasing switches in IDL and what
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
what happened to the various system libraries after the upgrade.

Anyone with more sysadmin-y nouse than me got any ideas? ChrisT et al?

cheers,

paulv

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[Message index]

		PNG output quality degraded after RHEL6 patch By: Paul Van Delst[1] on Mon, 16 December 2013 08:38
		Re: PNG output quality degraded after RHEL6 patch By: Starbuck on Mon, 16 December 2013 17:08
		Re: PNG output quality degraded after RHEL6 patch By: Paul Van Delst[1] on Tue, 17 December 2013 07:22

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