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

[Willow Carlson-Huber]

** 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 upload backports a commit from upstream which removes the alpha 
channel from the exported image.
+ 
+ [ Test Plan ]
+ 
+ * Open an image with transparency.
+ * 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>
+  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)

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

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