On 31/12/14 15:31, Robert J. Hansen wrote: > >> 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 advice hasn’t changed in over ten years; it’s probably out of date by now.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. > I take your point, Robert, regarding size. I've just tried a 240x288 image at 72 dpi and it is really small on my screen but it only weighs 29kB.
I'll have a look at your suggestion, keybase.io. Philip
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