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

[Thorsten Stettin]

Am 23.05.2016 um 23:59 schrieb Jehan Pagès:

Hi,

On Mon, May 23, 2016 at 11:42 PM, Thorsten Stettin
 wrote:

Am 23.05.2016 um 23:07 schrieb C R:

Yes, if "save comment" is unchecked it saves fine.
I never touch the comment, so it's strange that there would be something
invalid in it.

Thanks for looking into this.
Maybe we should create a bug report?


You have precedence. You know, I'm just a packager. :-P

In German: Bitte nach Ihnen.

But seriously: From where you got this picture? Please explain the entire
workflow from your camera.

IMHO information like this is very important in order to handle issues like
that:

Well from my point of view, it does not matter where the broken
metadata comes from, as long as it is not generated by GIMP (in which
case, yes it matters a lot! GIMP should not be able to create files
with broken metadata). Of course, if that's another Free Software
which created the metadata, it would be cool to report a bug there,
but that's still not an issue in GIMP.

The only issue I see in GIMP here is that broken metadata should not
be an export-stopper since it's a data bug which is easily catchable
and bypassed (by removing the wrong metadata).

Jehan

Au contraire mon capitan!

To cut a long story short:

It's very important to know from where comes Gimp's lag regarding non 
corfirming data regardless they come from.



Cheers!




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

[Thorsten Stettin]

Am 23.05.2016 um 23:59 schrieb Jehan Pagès:

Hi,

On Mon, May 23, 2016 at 11:42 PM, Thorsten Stettin
 wrote:

Am 23.05.2016 um 23:07 schrieb C R:

Yes, if "save comment" is unchecked it saves fine.
I never touch the comment, so it's strange that there would be something
invalid in it.

Thanks for looking into this.
Maybe we should create a bug report?


You have precedence. You know, I'm just a packager. :-P

In German: Bitte nach Ihnen.

But seriously: From where you got this picture? Please explain the entire
workflow from your camera.

IMHO information like this is very important in order to handle issues like
that:

Well from my point of view, it does not matter where the broken
metadata comes from, as long as it is not generated by GIMP (in which
case, yes it matters a lot! GIMP should not be able to create files
with broken metadata). Of course, if that's another Free Software
which created the metadata, it would be cool to report a bug there,
but that's still not an issue in GIMP.

The only issue I see in GIMP here is that broken metadata should not
be an export-stopper since it's a data bug which is easily catchable
and bypassed (by removing the wrong metadata).

Jehan

Jehan,
you're right but IMHO Gimp should be bullet proof regarding to problems 
like this.

But I htink its not wrong to know why is it so. ;-)


This comes from exiftooll. The whole thing is here.

*exiftool ac_a4_document_holder_vintage_leather_brown_4..png**
**ExifTool Version Number : 10.10**
**File Name   :
ac_a4_document_holder_vintage_leather_brown_4..png**
**Directory   : .**
**File Size   : 1631 kB**
**File Modification Date/Time : 2016:05:23 23:28:11+02:00**
**File Access Date/Time   : 2016:05:23 23:29:26+02:00**
**File Inode Change Date/Time : 2016:05:23 23:28:27+02:00**
**File Permissions: rw-rw-r--**
**File Type   : PNG**
**File Type Extension : png**
**MIME Type   : image/png**
**Image Width : 1000**
**Image Height: 1000**
**Bit Depth   : 8**
**Color Type  : RGB with Alpha**
**Compression : Deflate/Inflate**
**Filter  : Adaptive**
**Interlace   : Noninterlaced**
**Exif Byte Order : Little-endian (Intel, II)**
**Bits Per Sample : 8 8 8**
**Image Description   : ..:\w�**
**Make: samsung**
**Camera Model Name   : SM-N910F**
**Orientation : Horizontal (normal)**
**X Resolution: 72**
**Y Resolution: 72**
**Resolution Unit : inches**
**Software: GIMP 2.9.3**
**Y Cb Cr Positioning : Centered**
**Exposure Time   : 1/100**
**F Number: 2.2**
**Exposure Program: Program AE**
**ISO : 50**
**Exif Version: 0220**
**Date/Time Original  : 2016:04:08 09:51:31**
**Create Date : 2016:04:08 09:51:31**
**Components Configuration: Y, Cb, Cr, -**
**Shutter Speed Value : 1/100**
**Aperture Value  : 2.2**
**Brightness Value: 4.61**
**Exposure Compensation   : -1/2**
**Max Aperture Value  : 2.2**
**Metering Mode   : Center-weighted average**
**Light Source: Unknown**
**Flash   : No Flash**
**Focal Length: 4.8 mm**
**User Comment: ..:\w�**
**Flashpix Version: 0100**
**Color Space : sRGB**
**Exif Image Width: 5312**
**Exif Image Height   : 2988**
**Sensing Method  : One-chip color area**
**Scene Type  : Directly photographed**
**Exposure Mode   : Auto**
**White Balance   : Auto**
**Focal Length In 35mm Format : 31 mm**
**Scene Capture Type  : Standard**
**Image Unique ID : H16USHH04SA**
**GPS Version ID  : 2.2.0.0**
**Photometric Interpretation  : YCbCr**
**Samples Per Pixel   : 3**
**Thumbnail Offset: 884**
**Thumbnail Length: 14883**
**Date Created: 2016:05:23**
**Time Created: 07:46:21-07:46**
**XMP Toolkit : XMP Core 4.4.0-Exiv2**
**Format  : image/png**
**Background Color: 255 255 255**
**Pixels Per Unit X   : 2835**
**Pixels Per Unit Y   : 2835**
**Pixel Units : meters**
**Modify Date : 2016:05:23 06:46:23**
**Aperture

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

[Tobias Ellinghaus]

Am Montag, 23. Mai 2016, 23:08:04 schrieb Jehan Pagès:
> Hi,

Hi.

[...]

> > **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.

To make matters worse, the MWG guidelines [0] state that "Exif tags documented 
in the Exif specification as type ASCII SHOULD be written as UTF-8".

[...]

> 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.

Or just copy the content verbatim, there might be a reason for it being the 
way it is.

> Could you please open a bug report about this issue so that we look
> into this issue?
> Thanks!
> 
> Jehan

Tobias

[...]

[0] http://metadataworkinggroup.org/pdf/mwg_guidance.pdf

signature.asc
Description: This is a digitally signed message part.
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Re: [Gimp-developer] png save broken in gimp edge ppa - There was an invalid UTF-8 string in the exif:ImageDescription

[Jehan Pagès]

Hi,

On Mon, May 23, 2016 at 11:42 PM, Thorsten Stettin
 wrote:
> Am 23.05.2016 um 23:07 schrieb C R:
>>
>> Yes, if "save comment" is unchecked it saves fine.
>> I never touch the comment, so it's strange that there would be something
>> invalid in it.
>>
>> Thanks for looking into this.
>> Maybe we should create a bug report?
>
>
> You have precedence. You know, I'm just a packager. :-P
>
> In German: Bitte nach Ihnen.
>
> But seriously: From where you got this picture? Please explain the entire
> workflow from your camera.
>
> IMHO information like this is very important in order to handle issues like
> that:

Well from my point of view, it does not matter where the broken
metadata comes from, as long as it is not generated by GIMP (in which
case, yes it matters a lot! GIMP should not be able to create files
with broken metadata). Of course, if that's another Free Software
which created the metadata, it would be cool to report a bug there,
but that's still not an issue in GIMP.

The only issue I see in GIMP here is that broken metadata should not
be an export-stopper since it's a data bug which is easily catchable
and bypassed (by removing the wrong metadata).

Jehan

> This comes from exiftooll. The whole thing is here.
>
> *exiftool ac_a4_document_holder_vintage_leather_brown_4..png**
> **ExifTool Version Number : 10.10**
> **File Name   :
> ac_a4_document_holder_vintage_leather_brown_4..png**
> **Directory   : .**
> **File Size   : 1631 kB**
> **File Modification Date/Time : 2016:05:23 23:28:11+02:00**
> **File Access Date/Time   : 2016:05:23 23:29:26+02:00**
> **File Inode Change Date/Time : 2016:05:23 23:28:27+02:00**
> **File Permissions: rw-rw-r--**
> **File Type   : PNG**
> **File Type Extension : png**
> **MIME Type   : image/png**
> **Image Width : 1000**
> **Image Height: 1000**
> **Bit Depth   : 8**
> **Color Type  : RGB with Alpha**
> **Compression : Deflate/Inflate**
> **Filter  : Adaptive**
> **Interlace   : Noninterlaced**
> **Exif Byte Order : Little-endian (Intel, II)**
> **Bits Per Sample : 8 8 8**
> **Image Description   : ..:\w�**
> **Make: samsung**
> **Camera Model Name   : SM-N910F**
> **Orientation : Horizontal (normal)**
> **X Resolution: 72**
> **Y Resolution: 72**
> **Resolution Unit : inches**
> **Software: GIMP 2.9.3**
> **Y Cb Cr Positioning : Centered**
> **Exposure Time   : 1/100**
> **F Number: 2.2**
> **Exposure Program: Program AE**
> **ISO : 50**
> **Exif Version: 0220**
> **Date/Time Original  : 2016:04:08 09:51:31**
> **Create Date : 2016:04:08 09:51:31**
> **Components Configuration: Y, Cb, Cr, -**
> **Shutter Speed Value : 1/100**
> **Aperture Value  : 2.2**
> **Brightness Value: 4.61**
> **Exposure Compensation   : -1/2**
> **Max Aperture Value  : 2.2**
> **Metering Mode   : Center-weighted average**
> **Light Source: Unknown**
> **Flash   : No Flash**
> **Focal Length: 4.8 mm**
> **User Comment: ..:\w�**
> **Flashpix Version: 0100**
> **Color Space : sRGB**
> **Exif Image Width: 5312**
> **Exif Image Height   : 2988**
> **Sensing Method  : One-chip color area**
> **Scene Type  : Directly photographed**
> **Exposure Mode   : Auto**
> **White Balance   : Auto**
> **Focal Length In 35mm Format : 31 mm**
> **Scene Capture Type  : Standard**
> **Image Unique ID : H16USHH04SA**
> **GPS Version ID  : 2.2.0.0**
> **Photometric Interpretation  : YCbCr**
> **Samples Per Pixel   : 3**
> **Thumbnail Offset: 884**
> **Thumbnail Length: 14883**
> **Date Created: 2016:05:23**
> **Time Created: 07:46:21-07:46**
> **XMP Toolkit : XMP Core 4.4.0-Exiv2**
> **Format  : image/png**
> **Background Color: 255 255 255**
> **Pixels Per Unit X   : 2835**
> **Pixels Per Unit Y   : 2835**
> **Pixel Units : meters**
> **Modify Date : 2016:05:23 06:46:23**
> **Aperture: 

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

[C R]

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 
wrote:

> Hi,
>
> On Mon, May 23, 2016 at 7:59 PM, Thorsten Stettin
>  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
> >> > 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
> >>
> >> > ___
> >> > gimp-developer-list mailing list
> >> > List address: gimp-developer-list@gnome.org
> >> 
> >> > List membership:
> >> https://mail.gnome.org/mailman/listinfo/gimp-developer-list
> >> > List archives:
> https://mail.gnome.org/archives/gimp-developer-list
> >>
> >>
> >> ___
> >> gimp-developer-list mailing list
> >> List address: gimp-developer-list@gnome.org
> >> 
> >> List membership:
> >> https://mail.gnome.org/mailman/listinfo/gimp-developer-list
> >> List archives: https://mail.gnome.org/archives/gimp-developer-list
> >>
> >>
> >
> >
> > --
> > Lao-Tse sagt: Nichtstun ist besser, als mit viel Mühe nichts zu schaffen.
> > Und er sagt auch: Ich habe drei Schätze, die ich hüte und hege.
> > Der eine ist die Liebe, der zweite ist die Genügsamkeit, der dritte ist
> die
> > Demut.
> > Nur der Liebende ist mutig, nur der Genügsame ist großzügig, nur der
> > Demütige ist fähig zu herrschen.
> >
> > ___
> > gimp-developer-list mailing list
> > List address:gimp-developer-list@gnome.org
> > List membership:
> https://mail.gnome.org/mailman/listinfo/gimp-developer-list
> > List archives:   https://mail.gnome.org/archives/gimp-developer-list
>
>
>
> --
> ZeMarmot open animation film
> http://film.zemarmot.net
> Patreon: https://patreon.com/zemarmot
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> 

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

[Jehan Pagès]

Hi,

On Mon, May 23, 2016 at 7:59 PM, Thorsten Stettin
 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
>> > 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
>>
>> > ___
>> > gimp-developer-list mailing list
>> > List address: gimp-developer-list@gnome.org
>> 
>> > List membership:
>> https://mail.gnome.org/mailman/listinfo/gimp-developer-list
>> > List archives: https://mail.gnome.org/archives/gimp-developer-list
>>
>>
>> ___
>> gimp-developer-list mailing list
>> List address: gimp-developer-list@gnome.org
>> 
>> List membership:
>> https://mail.gnome.org/mailman/listinfo/gimp-developer-list
>> List archives: https://mail.gnome.org/archives/gimp-developer-list
>>
>>
>
>
> --
> Lao-Tse sagt: Nichtstun ist besser, als mit viel Mühe nichts zu schaffen.
> Und er sagt auch: Ich habe drei Schätze, die ich hüte und hege.
> Der eine ist die Liebe, der zweite ist die Genügsamkeit, der dritte ist die
> Demut.
> Nur der Liebende ist mutig, nur der Genügsame ist großzügig, nur der
> Demütige ist fähig zu herrschen.
>
> ___
> gimp-developer-list mailing list
> List address:gimp-developer-list@gnome.org
> List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
> List archives:   https://mail.gnome.org/archives/gimp-developer-list



-- 
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Patreon: https://patreon.com/zemarmot
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Re: [Gimp-developer] png save broken in gimp edge ppa - There was an invalid UTF-8 string in the exif:ImageDescription

[C R]

Yes, if "save comment" is unchecked it saves fine.
I never touch the comment, so it's strange that there would be something
invalid in it.

Thanks for looking into this.
Maybe we should create a bug report?

-C

On Mon, May 23, 2016 at 6:59 PM, Thorsten Stettin <
thorsten.stet...@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.*
>
>
> 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.
>
>
> Greetings
>
> Thorsten
>
>>
>> On Mon, May 23, 2016 at 11:24 AM, Thorsten Stettin <
>> thorsten.stet...@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
>>
>> > ___
>> > gimp-developer-list mailing list
>> > List address: gimp-developer-list@gnome.org
>> 
>> > List membership:
>> https://mail.gnome.org/mailman/listinfo/gimp-developer-list
>> > List archives: https://mail.gnome.org/archives/gimp-developer-list
>>
>>
>> ___
>> gimp-developer-list mailing list
>> List address: gimp-developer-list@gnome.org
>> 
>> List membership:
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>
> --
> Lao-Tse sagt: Nichtstun ist besser, als mit viel Mühe nichts zu schaffen.
> Und er sagt auch: Ich habe drei Schätze, die ich hüte und hege.
> Der eine ist die Liebe, der zweite ist die Genügsamkeit, der dritte ist
> die Demut.
> Nur der Liebende ist mutig, nur der Genügsame ist großzügig, nur der
> Demütige ist fähig zu herrschen.
>
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Re: [Gimp-developer] png save broken in gimp edge ppa - There was an invalid UTF-8 string in the exif:ImageDescription

[Thorsten Stettin]

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.*


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.



Greetings

Thorsten


On Mon, May 23, 2016 at 11:24 AM, Thorsten Stettin 
> 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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--
Lao-Tse sagt: Nichtstun ist besser, als mit viel Mühe nichts zu schaffen.
Und er sagt auch: Ich habe drei Schätze, die ich hüte und hege.
Der eine ist die Liebe, der zweite ist die Genügsamkeit, der dritte ist die 
Demut.
Nur der Liebende ist mutig, nur der Genügsame ist großzügig, nur der Demütige 
ist fähig zu herrschen.

___
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List address:gimp-developer-list@gnome.org
List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list
List archives:   https://mail.gnome.org/archives/gimp-developer-list