Almost as long as we've had photos, we've been removing "unappealing" things from them. Famously Stalin had Nikolai Yezhov removed from a photo after he was "purged", but the Soviet Union in general is full of these instances.
More lightheartedly, Disney supposedly (though this seems to be subject to some debate) has airbrushed a number of photographs of Walt Disney to remove cigarettes from them. And perhaps most famously of all, Han only shot first if you were born before 1997.