There is no Powerpoint reader in FME, but is it still somehow possible to replace background and/or color/styling on existing powerpoints on several Powerpoint-files by using FME?
+44- Safer
I don't think so. Background images are defined by the master slide in Powerpoint, and FME doesn't touch those. If you create a new powerpoint with the new style, then you can create new slides, but can't amend existing ones. You'd have to save the original powerpoint as an FME-readable format (PDF?!), read it back with FME, reconstruct/restyle it, then write it to a powerpoint using the new template.
But I think you'd have to be working with a large number of powerpoints, to spend time getting that to work. Otherwise you may as just well open each in turn and set the background manually.
+28- Contributor
I would investigate using python-pptx.
I've had very good success with the corresponding python-docx package.
Alternatively you could change the extension from pptx to zip, and then use the xml readers/writers and transformers to update the slide.
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