[Bug 2143000] Re: Can't save converted file .png > .jpg

[Andreas Hasenack]

Hello corrado, or anyone else affected,

Accepted shotwell into resolute-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/shotwell/0.32.13-2ubuntu1.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
resolute to verification-done-resolute. If it does not fix the bug for
you, please add a comment stating that, and change the tag to
verification-failed-resolute. In either case, without details of your
testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Description changed:

  [ Impact ]
  
  * Exporting to JPEG fails for images with an alpha channel.
-     * This is correct behavior on the part of the underlying image library; 
JPEG does not support transparency.
+     * This is correct behavior on the part of the underlying image library; 
JPEG does not support transparency.
  * This upload backports a commit from upstream which removes the alpha 
channel from the exported image.
  
  [ Test Plan ]
  
- * Open an image with transparency.
+ * Open an image with transparency (sample image from comment #7, 
https://bugs.launchpad.net/ubuntu/+source/shotwell/+bug/2143000/+attachment/5999184/+files/transparency-test.png)
  * Select File > Export, and choose JPEG as the target format.
  * Attempt an export.
  
  [ Where problems could occur ]
  
  * This upload applies a commit from upstream without any additional changes.
  * It's possible that this change might fail in exotic color spaces or other 
extenuating circumstances, but that would lead back to a bug in the underlying 
image library.
  
  [ Original report follows ]
  
  Try to convert a small picture from .png to .jpg but i receive an error 
message.
  Same picture is successfully converted using gthumb.
  See attached screenshot.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: shotwell 0.32.13-2ubuntu1
  ProcVersionSignature: Ubuntu 6.19.0-6.6-generic 6.19.2
  Uname: Linux 6.19.0-6-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Mar  1 21:15:39 2026
  InstallationDate: Installed on 2026-02-13 (17 days ago)
  InstallationMedia: Ubuntu 26.04 LTS "Resolute Raccoon" - Daily amd64 
(20260213)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: shotwell
  UpgradeStatus: No upgrade log present (probably fresh install)

** Changed in: shotwell (Ubuntu Resolute)
       Status: In Progress => Fix Committed

** Tags added: verification-needed-resolute

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https://bugs.launchpad.net/bugs/2143000

Title:
  Can't save converted file .png > .jpg

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