Exported .png files are blue

Stradling · November 23, 2007, 3:22pm

Some odd things happening with PNG exports on my Mac (10.5, PPC).

I plot distributions with either ROOT or PyROOT, and get the normal default results - black points on white. From the recent trunk of SVN, however, the points on all exported PNG files come out kBlue. This is also the case with JPG files, but not GIFs - which seem to be fine. Examples below.

(As an aside, SVGs never seem to open, and PDFs are not responsive. TIFFs are apparently not supported.)

I tried the same code and data on a SLC4 machine using 5.14/00h (from the Athena 13.0.30 release) - it worked great and did the colors just as I wanted them.

Any suggestions?

Thanks,

Alden

couet · November 23, 2007, 3:31pm

Can you send me the SVG and PDF files ?

Stradling · November 23, 2007, 3:40pm

Sure.

In fairness, I’m sure the PDF is so unresponsive because I have ~2e6 data points in the first plot.

The plots are too large to post - please have a look in /afs/cern.ch/user/s/stradlin/public/plots.zip

Thanks,

Alden

couet · November 23, 2007, 3:53pm

It looks like these files have a huge number of points. The pdf is 23Mb and the SVG 1Gb. GV and Acroread failed to open it. You are right to prefer bitmap output like gif.
Can the “blue effect” be reproduced with any picture or a specific macro is neede on Mac ?

Stradling · November 23, 2007, 4:18pm

[quote=“couet”]It looks like these files have a huge number of points. The pdf is 23Mb and the SVG 1Gb. GV and Acroread failed to open it. You are right to prefer bitmap output like gif.
Can the “blue effect” be reproduced with any picture or a specific macro is neede on Mac ?[/quote]

This was generated initially with very basic CINT commands. Basically -

TFile *f = new TFile(“BeamHalo.root”)
ntuple.Draw(“pT:X”)
c1.Print(‘file.png’)

Stradling · November 23, 2007, 4:37pm

More data - all works fine with OS X, Tiger, 5.14/00e.

couet · November 23, 2007, 4:39pm

Ok we will investigate

Valeriy_Onuchin · November 24, 2007, 2:40pm

Hi,
this problem on PowerPC is known and is related to libAfterImage
(on big endian systems).
I sent report about this to the author (Sasha Vasko).
Hopefully must be investigated and fixed soon.

Regards. Valeriy

Stradling · November 26, 2007, 7:25am

Thanks - I’m anxious for the fix.

Cheers,

Alden

Stradling · December 10, 2007, 6:18pm

Has there been a fix to this problem? Is it worthwhile to rebuild ROOT and give it a try?

Thanks,

Alden

couet · December 11, 2007, 9:03am

This problem is still pending.

darsatdusk · August 11, 2021, 6:12am

Dear all,

Is this issue resolved? I just started to experience this yesterday on my iMac after 7 years of normal operation.

couet · August 18, 2021, 2:39pm

Do you have a reproducer ? This thread in 14 years old. I do have the reproducer anymore.

darsatdusk · August 20, 2021, 4:34am

Dear Oliver,

What do you mean by a “reproducer”? This has been happening only for a week or so now and it happens with both a macro and from the command line. In both cases I can make correct PDF and EPS files, but I also found out that the JPG files also turn out blue.

For reference, this has been happening on an iMac with Catalina OS, but ROOT was working normally since October or so when I first installed it. In light of that, it may be a problem with a recent update, but I don’t know what aspect this is attributed to.

Thanks for your help.

~Doug
Douglas Rodriguez, PhD

couet · August 20, 2021, 7:21am

Hi Doug,

Ok so it happens with any plots ? Looking back in the 2007 posts, it appeared to be on PowerPC machines. Is that your case ?

~Olivier

darsatdusk · August 20, 2021, 12:16pm

Hi, Oliver.

Any graph or histogram that I save as a PNG or PJG on my iMac turns blue. Otherwise these are fine.

~Doug Rodriguez, PhD

couet · August 20, 2021, 1:39pm

Is it A powerPC ? I do not see this on recent Mac

darsatdusk · August 21, 2021, 1:44am

No, it’s not a powerPC. Just a simple iMac from 2014 running macOS Catalina (not sure what sub-version).

~Doug
Douglas Rodriguez, PhD

couet · August 23, 2021, 7:32am

It seems that bug was visible on some specific Mac architecture (PowerPC ?). I was never able to reproduce it. Since 2007 there was no new bug fixes from the author of libAfterImage . May be @Valeriy_Onuchin has more details about it. But as it is 14 years old I doubt there will be anything new.

eguiraud · August 23, 2021, 9:58am

Hi @darsatdusk ,
as @couet mentioned the real issue is that we are not able to reproduce this. Do you see the issue on LXPLUS, in a Docker container or when installing ROOT from macports, homebrew or conda (see Installing ROOT - ROOT)?

Cheers,
Enrico