Philip Jackson philip.jackson at
Wed Dec 31 23:21:12 CET 2014

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  That advice hasn’t changed in over ten years; it’s probably out of date by now.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, 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,


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