[Update: there is a nice working plugin that does the trick, see here]
In GIMP exporting multiple layers to one pdf file is surprisingly difficult. I found two solution, both require additional software besides GIMP, but are fairly easy to implement. One solution is given
here. [this link doesn't work anymore] It requires a plug-in or script to export individual layers to separate tiff files (something which perhaps surprisingly is not possible out-of-the-box in GIMP).
The before-mentioned site suggest the script “Save Layers as Individual Files”, which can be
downloaded [this link doesn't work anymore] from Panotools. Next step is to use ImageMagick to convert the tiff files into a single pdf file. Unfortunately the script throws up an error when I try to open it.
- Open the GIMP file with multiple layers
- Make sure to order the layers in reverse order, page 1 must by the bottom layer, the last page the top layer
- Save the file as a MNG animation. In the dialogue that comes up, select “save as animation”.
- Now, open the terminal and use the command ‘convert document.mng document.pdf’ to export the mng file to a pdf file.
Credits go to Patrick’s WebLog, go there for more details.