Bug#1059359: gimp: GIMP corrupts alpha layer when saving as .PNG

[Gary Dale]

Package: gimp
Version: 2.10.36-2
Severity: normal

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
I add an alpha layer to an image, make some areas transparent then export the image as a .PNG file

   * What exactly did you do (or not do) that was effective (or ineffective)?
I can expost the image to a .GIF file but when I export it as a .PNG, the transparent areas as mostly 
filled with garbage

   * What was the outcome of this action?
   * What outcome did you expect instead?

*** End of the template - remove these template lines ***


-- System Information:
Debian Release: trixie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.4.0-2-amd64 (SMP w/24 CPU threads; PREEMPT)
Locale: LANG=iu_CA.UTF-8, LC_CTYPE=C.UTF-8 (charmap=locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
UTF-8), LANGUAGE=en_GB
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gimp depends on:
ii  gimp-data            2.10.36-2
ii  graphviz             2.42.2-7+b3
ii  libaa1               1.4p5-50
ii  libbabl-0.1-0        1:0.1.106-3
ii  libbz2-1.0           1.0.8-5+b1
ii  libc6                2.37-12
ii  libcairo2            1.18.0-1
ii  libfontconfig1       2.14.2-6
ii  libfreetype6         2.13.2+dfsg-1
ii  libgcc-s1            13.2.0-7
ii  libgdk-pixbuf-2.0-0  2.42.10+dfsg-3
ii  libgegl-0.4-0        1:0.4.46-4
ii  libgexiv2-2          0.14.2-2
ii  libgimp2.0           2.10.36-2
ii  libglib2.0-0         2.78.3-1
ii  libgs10              10.02.1~dfsg-1
ii  libgtk2.0-0          2.24.33-2
ii  libgudev-1.0-0       238-3
ii  libharfbuzz0b        8.0.1-1
ii  libheif1             1.17.4-1
ii  libjpeg62-turbo      1:2.1.5-2
ii  libjson-glib-1.0-0   1.8.0-2
ii  libjxl0.7            0.7.0-10.2
ii  liblcms2-2           2.14-2
ii  liblzma5             5.4.5-0.1
ii  libmng1              1.0.10+dfsg-3.1+b5
ii  libmypaint-1.5-1     1.6.0-2
ii  libopenexr-3-1-30    3.1.5-5.1
ii  libopenjp2-7         2.5.0-2
ii  libpango-1.0-0       1.51.0+ds-3
ii  libpangocairo-1.0-0  1.51.0+ds-3
ii  libpangoft2-1.0-0    1.51.0+ds-3
ii  libpng16-16          1.6.40-2
ii  libpoppler-glib8     22.12.0-2+b1
ii  librsvg2-2           2.54.7+dfsg-2
ii  libstdc++6           13.2.0-7
ii  libtiff6             4.5.1+git230720-3
ii  libwebp7             1.3.2-0.3
ii  libwebpdemux2        1.3.2-0.3
ii  libwebpmux3          1.3.2-0.3
ii  libwmf-0.2-7         0.2.13-1.1
ii  libwmflite-0.2-7     0.2.13-1.1
ii  libx11-6             2:1.8.7-1
ii  libxcursor1          1:1.2.1-1
ii  libxext6             2:1.3.4-1+b1
ii  libxfixes3           1:6.0.0-2
ii  libxmu6              2:1.1.3-3
ii  libxpm4              1:3.5.17-1
ii  xdg-utils            1.1.3-4.1
ii  zlib1g               1:1.3.dfsg-3

Versions of packages gimp recommends:
ii  ghostscript  10.02.1~dfsg-1

Versions of packages gimp suggests:
pn  gimp-data-extras          <none>
pn  gimp-help-en | gimp-help  <none>
ii  gvfs-backends             1.52.1-1
ii  libasound2                1.2.10-3

-- debconf information:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = "en_GB",
	LC_ALL = (unset),
	LC_TIME = "en_CA.UTF-8",
	LC_MONETARY = "en_CA.UTF-8",
	LC_CTYPE = "C.UTF-8",
	LC_COLLATE = "en_CA.UTF-8",
	LC_MEASUREMENT = "en_CA.UTF-8",
	LC_NUMERIC = "en_CA.UTF-8",
	LANG = "iu_CA.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

-- debsums errors found:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = "en_GB",
	LC_ALL = (unset),
	LC_TIME = "en_CA.UTF-8",
	LC_MONETARY = "en_CA.UTF-8",
	LC_CTYPE = "C.UTF-8",
	LC_COLLATE = "en_CA.UTF-8",
	LC_MEASUREMENT = "en_CA.UTF-8",
	LC_NUMERIC = "en_CA.UTF-8",
	LANG = "iu_CA.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").