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IDL-69024 bug fixed in v8.4? [message #91548] Tue, 28 July 2015 12:06 Go to next message
Paul Van Delst[1] is currently offline  Paul Van Delst[1]
Messages: 1157
Registered: April 2002
Senior Member
Hello,

Once again, I'm tearing my hair out about the quality of
function-graphics-generated PNG output (via Save method) versus the
onscreen look.

Searching the idl newsgroup arhive I found the post where

<quote>
$ export IDL_DISABLE_STROKED_LINES=1

The issue has been reported as IDL-69024.
</quote>

would get around the issue (and it mostly does)

Does anyone know if this problem was fixed in v8.4? (I still have 8.3).
Chris Torrance talked about a new ANTIALIAS keyword to the ::Save method
in a post back in Feb2014 - the online v8.4.1 docs tells me it's
available in the ::Save method....but does it do the job?

(I need a reason for an upgrade request)

Thanks for any info.

cheers,

paulv

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Re: IDL-69024 bug fixed in v8.4? [message #91549 is a reply to message #91548] Wed, 29 July 2015 00:45 Go to previous messageGo to next message
Helder Marchetto is currently offline  Helder Marchetto
Messages: 520
Registered: November 2011
Senior Member
Hi Paul,
I have 8.4.1. How can I reproduce your error/problem?
I've put the results of David's procedure that can be found here:
http://www.idlcoyote.com/gallery/additional_axes_plot_fg.pro

in here:
http://idl.marchetto.de/antialias-test/

I don't see any difference with or without the antialias.

Is this different from what you get with 8.3?

Cheers,
Helder

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Re: IDL-69024 bug fixed in v8.4? [message #91560 is a reply to message #91548] Wed, 29 July 2015 13:49 Go to previous messageGo to next message
chris_torrence@NOSPAM is currently offline  chris_torrence@NOSPAM
Messages: 528
Registered: March 2007
Senior Member
On Tuesday, July 28, 2015 at 1:07:03 PM UTC-6, Paul van Delst wrote:
> Hello,
>
> Once again, I'm tearing my hair out about the quality of
> function-graphics-generated PNG output (via Save method) versus the
> onscreen look.
>
> Searching the idl newsgroup arhive I found the post where
>
> <quote>
> $ export IDL_DISABLE_STROKED_LINES=1
>
> The issue has been reported as IDL-69024.
> </quote>
>
> would get around the issue (and it mostly does)
>
> Does anyone know if this problem was fixed in v8.4? (I still have 8.3).
> Chris Torrance talked about a new ANTIALIAS keyword to the ::Save method
> in a post back in Feb2014 - the online v8.4.1 docs tells me it's
> available in the ::Save method....but does it do the job?
>
> (I need a reason for an upgrade request)
>
> Thanks for any info.
>
> cheers,
>
> paulv

Hi paulv,

This bug is not fixed. It turns out to be a very difficult problem. I would recommend using either the IDL_DISABLE_STROKED_LINES workaround, or perhaps playing arount with the ANTIALIAS keyword which was added for IDL 8.4.

-Chris

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Re: IDL-69024 bug fixed in v8.4? [message #91585 is a reply to message #91549] Mon, 03 August 2015 06:42 Go to previous messageGo to next message
Paul Van Delst[1] is currently offline  Paul Van Delst[1]
Messages: 1157
Registered: April 2002
Senior Member
Hi Helder,

On 07/29/15 03:45, Helder wrote:
> Hi Paul,
> I have 8.4.1. How can I reproduce your error/problem?
> I've put the results of David's procedure that can be found here:
> http://www.idlcoyote.com/gallery/additional_axes_plot_fg.pro
>
> in here:
> http://idl.marchetto.de/antialias-test/
>
> I don't see any difference with or without the antialias.
>
> Is this different from what you get with 8.3?

Yes.

How it appears onscreen (via a screen capture) is shown here:
ftp://ftp.emc.ncep.noaa.gov/jcsda/CRTM/.plots/atms_npp-12.on screen.png
Lovely!

The FG output using the ::Save method is shown here:
ftp://ftp.emc.ncep.noaa.gov/jcsda/CRTM/.plots/atms_npp-12.pn g
Chunky!

The most obvious indications of the problem are the smooth sides of the
plots - using ::Save they are noticeably pixelated. It reminds me of my
early postgrad days when I was writing assembly code on my pokey 8088
PC-XT with a 640x512 screen to implement Brensenham's algorithm[*]

ChrisT answered my question re: the bug fix and, since you don't see any
difference in your test when you use the Alias keyword, I guess it's
time for me to ask for an upgrade.

Thanks,

paulv

[*] taken from Byte magazine! Gosh. Good times. :o)

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Re: IDL-69024 bug fixed in v8.4? [message #91586 is a reply to message #91560] Mon, 03 August 2015 06:44 Go to previous message
Paul Van Delst[1] is currently offline  Paul Van Delst[1]
Messages: 1157
Registered: April 2002
Senior Member
On 07/29/15 16:49, Chris Torrence wrote:
> On Tuesday, July 28, 2015 at 1:07:03 PM UTC-6, Paul van Delst wrote:
>>
>> <quote>
>> $ export IDL_DISABLE_STROKED_LINES=1
>>
>> The issue has been reported as IDL-69024.
>> </quote>
>>
>
> Hi paulv,
>
> This bug is not fixed. It turns out to be a very difficult problem.
> Iwould recommend using either the IDL_DISABLE_STROKED_LINES workaround,
> or perhaps playing arount with the ANTIALIAS keyword which was added for
> IDL 8.4.

O.k., thanks Chris.

cheers,

paulv

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