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. 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 from Panotools. Next step is to useImageMagick to convert the tiff files into a single pdf file.
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