Image generation in the Google Gemini app, known as Nano Banana, is now among the most widely used generators. It is also the clearest case of a file whose result depends on whether you scan the original or a forwarded copy.
Originals downloaded from the Gemini app often keep Google's C2PA signature together with a visible mark. Origma verifies the signature and also reads the visible mark, so such originals come back «Likely AI-generated» from provenance evidence alone.
Google also embeds an invisible watermark called SynthID, but its detector is not public, so Origma cannot read it. When the signature and visible mark are gone, the call rests on pixel detectors instead.
A copy received through a messenger loses its signature and metadata and is recompressed. As the box above shows, the newest Nano Banana models are a generator our detectors still catch poorly, so such copies often come back inconclusive. Inconclusive does not mean a person made it.
Whenever possible, get the original file from whoever made it. In a messenger, sending as an original file or as an attachment is more likely to keep the signature. If all you have is a copy, accept inconclusive as the conclusion and confirm the source another way.
This is general guidance, not legal advice. A scan result is a probabilistic assessment, not proof.