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 <mailto: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

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--
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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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