@neil it is difficult to comply with “indicate whether a photograph has been retouched”, every image is retouched right? The camera takes a raw image that’s then processed by the computer (a phone generally) and then stored in a standard raster graphics format such as JPEG.
To process the image a lot of things happen that in effect amount to retouching. Things like noise reduction, white balance adjustment, tone adjustment, etc… retouching!
@neil that’s not to mention I can “retouch” on camera. I can willingly overexpose a portrait even with a film camera to reduce the appearance of wrinkles… and guess what, when a human develops that film then can also retouch at that stage too using various techniques.
Or I can wear makeup and retouch my face.
I have an idea, just label everything “image may have been retouched” by default. That’s the only way to truly comply.