Back in the days I was taught, for photos taken with a digital camera, that one had to do certain steps before uploading that photo to the internet, to avoid leaking which exact produced/sold camera module took the photo.

The steps were:

Convert image in GIMP or other regular known safe image editing software to BMP format. This is to remove all metadata from the image, since BMP does not support metadata. This will remove JPEG quantization tables, color correction information, and any Exif metadata the camera may have added.
Open that BMP image, scale it down as far as possible without losing important visual details, and then scale it up by a slight amount again. The purpose is because every camera module has its own manufacturing defects, which may express itself as individual pixel grid light sensors being likelier to have a higher or lower pixel value than neighboring ones. By scaling down, all fine-grained noise and similar patterns should be blurred out to mask this. I am uncertain why one were to upscale the image slightly again, maybe it blurred it a little bit more without affecting visual clarity much.
Convert to JPEG with standard settings.

I am uncertain whether step 1 is obsolete with GrapheneOS camera app. I guess it only uses standard JPEG quantization tables, but does it use standard color correction information or does it use calibrated color correction information from the camera module? Does it embed any other information from the device or camera module?

Step 2 I can find no way to accomplish in GrapheneOS. Not even by editing the image in the Gallery app afterwards. I guess it would be very good for activists and journalists reporting on police violence, human rights violations and corruption and similar if there is a setting in the camera app itself to enable for extra privacy, that naturally saves the image in a lower resolution, appropriately blurred, and without any color correction information or other information from the camera module.

This was just an idea I got. I have no need for this myself in the activism I do, but it sounds like the kind of feature GrapheneOS might want to have.