Geneva Convention and showing pictures of POWs

What is it about showing pictures of POWs that goes against the Geneva Convention? Or is there more to it than just “showing pictures”, i.e. showing them being tortured or something?

Also, didn’t we show pictures of captured Al-Qaeda prisoners back when we went into Afghanistan? What’s the difference and why wasn’t THAT against the Geneva Convention? (My guess is because technically they weren’t “POWs”, they were “Enemy Combatants” and therefore not subject to the same treatment as POWs, although that seems like awful fine hair-splitting to me.)

From the Geneva Conventions - Convention (III) relative to the Treatment of Prisoners of War:

There is a difference between showing pictures/film of POWs and putting them on public display. Both the US and Iraq are signatories of the Geneva Conventions, and are therefore bound by the Conventions in this case.