> I've been looking for documentation with info on adding a photo id to a gpg > key. > The instructions for adding are available but I can't find any advice for the > size, format, dpi etc of the image to be used.
The major problem is there is very little good advice about this, and what there is keeps changing. For a long time the PGP Desktop product used 120x144 as a picture size. Back when a high-resolution display was 800x600 it made a lot of sense; now, when my laptop has a 2880x1800 display, a 120x144 image is literally smaller than a postage stamp. GnuPG adopted the photo-ID feature a few years later and technology had already progressed to the point where the GnuPG advice was 240x288. That advice hasn’t changed in over ten years; it’s probably out of date by now. With respect to what format should be used, the de-facto standard seems to be JPEG. I personally don’t find photo ID to be a useful feature. They’re too static. The photo ID on my certificate, for instance, is almost ten years old. If you need photo ID, a better route would appear to be something like keybase.io, which offers some neat tools for binding a certificate to photographs, social media accounts, and whatnot.
smime.p7s
Description: S/MIME cryptographic signature
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