I'm trying to put together a photobooth. I'm using gphoto2 to capture photos from my DSLR but I would like to put simple filters on the jpg pictures it takes like those that are available in RaspiStill and I'd like to be able to apply them without opening a GUI. I would also like to be able to add watermark or banner to the image. I would even be happy potentially if I could apply the RaspiStill filters to an existing image instead of a fresh capture. If that's possible or if there is another program that isn't GIMP or a massive paint/photoshop style program please let me know!
Thank you in advance.
-James