Re: [Gimp-developer] png save broken in gimp edge ppa - There was an invalid UTF-8 string in the exif:ImageDescription

[C R <cajhne gmail com>]

Report created here:
https://bugzilla.gnome.org/show_bug.cgi?id=766824

I've set it to normal priority, but feel free to change. :)

-C




On Mon, May 23, 2016 at 10:08 PM, Jehan Pagès <jehan marmottard gmail com>
wrote:

> Hi,
>
> On Mon, May 23, 2016 at 7:59 PM, Thorsten Stettin
> <thorsten stettin gmail com> wrote:
> > Am 23.05.2016 um 15:00 schrieb C R:
> > > Happens every time with this file:
> http://www.whitecatgraphics.com/opendesignstudio/gimp/samples/ac_a4_document_holder_vintage_leather_brown_4.png
> > > steps to reproduce:
> > > 1.open the downloaded file in gimp
> > > 2.export as "ac_a4_document_holder_vintage_leather_brown_4a.png"
> > > 3.these boxes in png export are checked: "save background colour", and
> all
> > > checkboxes after and including Save resolution, compression level 9, and
> > > everything under advanced checked.
> >
> >
> > Hi
> >
> > At home in Xenial I exported your picture with save comment.
> > The above error occurred.
> > Hmm.
> >
> > I took a look at the comment field exactly the exif:ImageDescription: It
> > contains an invalid UTF-8 string.
> >
> > *identify -verbose ac_a4_document_holder_vintage_leather_brown_4.png |
> grep
> > -i desc **
> > **    exif:ImageDescription: ..:\w.*
>
> According to the Exif spec
> (http://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf), even UTF-8
> should be invalid. This field is supposed to be ASCII only apparently
> (yes that's sucky, definitely). To use multi-byte encoding, such as
> UTF-8 (or others such as JIS), the right field is UserComment.
>
> > After replacing the picture comment content with Gimp's standard one -
> valid
> > UTF-8, I think - I could export your picture without any problem.
> >
> > *identify -verbose ac_a4_document_holder_vintage_leather_brown_4a.png |
> grep
> > -i desc
> >     exif:ImageDescription: Created with GIMP*
> >
> > I guess it's a bug regarding the comment string and/or character set
> > handling. Maybe a wrong character set was using in the
> exif:ImageDescription
> > field, I assume.
>
> All this said, it would be good if GIMP were more robust to
> otherwise-valid images, even with buggy metadata. In particular, it
> should not fail to export, but simply discard the wrong metadata field
> with a warning.
>
> Could you please open a bug report about this issue so that we look
> into this issue?
> Thanks!
>
> Jehan
>
> > Greetings
> >
> > Thorsten
> > > On Mon, May 23, 2016 at 11:24 AM, Thorsten Stettin
> > > <thorsten stettin gmail com <mailto:thorsten stettin gmail com>> wrote:
> > >
> > >     Am 23.05.2016 um 08:44 schrieb C R:
> > >     > Fails on export with a Plug-in crash:
> > >     >
> > >     > "Procedure 'file-png-save-defaults' returned no return values
> > >     >
> > >     >
> > >     > Strangely, if you save as a jpeg first, it exports to png just
> fine.
> > >     >
> > >     > Steps to reproduce:
> > >     > 1. Open File
> > >     > 2. Export to png
> > >     >
> > >     > Results in the above crash.
> > >     >
> > >     > Ver: GIMP 2.9.3
> > >     > Ubuntu 16.04 with gnome-shell 3.18.4
> > >     >
> > >     > -C
> > >     Under Trusty I can't reproduce that behavior. :-(
> > >
> > >     gimp Version 2.9.3.81-0t0~ppa
> > >     libgegl-0.3-0 1:0.3.6.20-0t0~ppa
> > >
> > >     Cheers
> > >
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> > --
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