Export Layers is a GIMP plug-in that exports layers as separate images in almost any file format supported by GIMP and possibly third-party plug-ins.
From the package, extract the "export_layers.py" file and the "export_layers" directory
to "[home directory]/.gimp-2.8/plug-ins".
On Linux, if necessary, enable the executable flag on the "export_layers.py" file, e.g. from the terminal:
chmod u+x "export_layers.py"
It should no longer be needed for versions 2.1 and above.
From the main menu, go to "File -> Export Layers...". A dialog appears, allowing you to specify output directory, file extension and various other settings.
Type the file extension in the File Extension text field (with or without the leading dot).
To export layers, press the "Export Layers" button. For the first layer, a dialog corresponding to the file format appears, allowing you to adjust file format settings. Not all file formats have settings, so no dialog may appear. For subsequent layers, the file export procedure uses the values you specified in the dialog for the first file.
If you want to export the layers with the last values used, you can use the "File -> Export Layers to" menu entry. The file format dialog will not be displayed - instead, the last used values will be used.
2.1, July 27, 2014
* Added Unicode support.
* Progress bar and Stop button are now displayed in the main dialog.
* Removed "Remove square brackets" setting.
* Added "Ignore layer modes" setting.
* Renamed "File format" to "File extension" and, accordingly, a bunch of other related settings.
For more information, such as the full list of settings, known issues or the full list of changes, read the Readme.txt and Changelog.txt files in the package or see the GitHub page for the plug-in: